Disclosure: Some links in this article are affiliate links. We may earn a commission on qualifying purchases at no extra cost to you.
The best ergonomic keyboard and mouse combo for most people is the Logitech Wave Keys and Lift. It is the only major-brand kit that arrives as a single product, shares one Logi Bolt receiver, and asks for almost no adjustment period. If you already own a mouse and want a standalone upgrade, our best ergonomic mouse picks cover the vertical and trackball options separately.
Two things decide a purchase here, and neither is the name on the box. The first is whether the board and the mouse share one receiver, because a two-dongle setup quietly undoes the point of buying a combo. The second is hand size: a vertical mouse that suits a 19 cm hand will feel wrong in a 16 cm one, and the picks below are grouped so you can check fit before anything else.
The list runs from curved membrane boards under a shared dongle to a fully split mechanical setup with a trackball, plus the Mac-keyed pairing. Where a real kit does not exist, the two pieces are listed as a pairing with the receiver situation spelled out, so you know what actually arrives in the box.
Quick Picks
| Combo | Best for | Keyboard shape | Mouse type | Hand fit |
|---|---|---|---|---|
| Logitech Wave Keys and Lift | Most people, one dongle | Curved wave | Vertical | Small to medium |
| Logitech ERGO K860 + Lift / MX Vertical | Negative tilt and a split keyframe | Split keyframe | Vertical | Small-medium (Lift) / medium-large (MX Vertical) |
| Logitech Wave Keys for Mac + Lift for Mac | Mac users | Curved wave | Vertical | Small to medium |
| Kinesis Freestyle Edge RGB+ + MX Ergo S | Mechanical split with tenting | Fully split mechanical | Trackball | Medium to large |
| Kinesis Freestyle2 + vertical mouse | Widest split, wired | Fully split membrane | Vertical | Match to mouse |
| ProtoArc EKM01 Plus | Budget full-size kit | Curved split | Sculpted standard | Standard |
| Perixx Periboard-612 + Perimice-713 | Budget split | Split membrane | Vertical | Big hands per maker |
| Kensington Pro Fit Ergo KM675 EQ | Budget single kit | Curved compact | Vertical | Larger hands |
| Logitech MX Keys S + MX Master 4 | Comfort without a split | Straight | Sculpted standard | Wider range |
What Makes a Great Ergonomic Keyboard and Mouse Combo?
Three keyboard shapes appear in this category, and they are separated by how long they take to learn. A curved board such as the Wave Keys bends the key rows without splitting them, so it disturbs existing typing habits the least. A split keyframe board such as the ERGO K860 separates the left and right key groups while keeping them on one panel, and most people adapt to it faster than to a fully split design. A fully split board such as the Kinesis Freestyle2 puts two independent modules at shoulder width, which is the layout that takes weeks rather than days.
Tenting raises the middle of the board to reduce forearm rotation, and negative tilt drops the front edge so the wrists are not extended upward to reach the keys. The Wave Keys offers only a +4 degree tilt with no negative position. The K860 adds legs at 0, -4 and -7 degrees. The Kinesis Edge RGB+ ships with a Lift Kit for 5, 10 and 15 degree tenting, and the Freestyle2 reaches its tenting angles through separately sold V3, VIP3 or Ascent accessories.
One point applies to every board with a fixed palm rest: the rest should support the heel of the palm rather than the wrist itself. Because the rests on the Wave Keys, the K860 and the ProtoArc boards are built in and not removable, they add depth at the front edge. The K860 measures 17.95 inches wide and the ProtoArc EKM01 Plus 20.75 inches, so measure the desk before committing.
On the mouse side the real split is vertical against sculpted standard. Vertical shells rotate the grip toward a handshake, and the model should follow hand length: Logitech sizes the Lift for small to medium hands, the MX Vertical for medium to large, and the ProtoArc EM11 NL for hands under 7.5 inches. A trackball removes arm travel altogether and the MX Ergo S targets medium to large hands.
Finally, confirm how the two pieces connect. A kit that ships one receiver drives both devices from a single port. A pairing where one device uses Logi Bolt and the other Unifying needs two dongles or a Bluetooth fallback. That single detail separates a true combo from two boxes sold together. If the wireless layer is new to you, our dongle versus Bluetooth versus USB-C breakdown covers the trade-offs.
#1 Logitech Wave Keys and Lift: The One-Dongle Kit
| Attribute | Detail |
|---|---|
| Keyboard shape | Curved wave, not split, built-in cushion palm rest |
| Tilt | +4 degrees, no negative tilt |
| Keyboard size and weight | 14.8 x 8.62 x 1.2 in, 750 g |
| Keys | Plunger-style membrane, no backlight |
| Mouse shape | Vertical, 57 degrees |
| Mouse fit | Small to medium hands, left-hand Lift sold separately |
| Sensor and buttons | 400 to 4000 DPI in 100-DPI steps, 6 buttons |
| Receiver | One shared Logi Bolt USB receiver |
| Battery | 2x AAA keyboard (up to 36 months), 1x AA mouse (up to 24 months) |
| OS | Windows 10/11, macOS 12+, Linux, ChromeOS, iPadOS 15+, Android 12+ |
The keyboard is a compact full layout with a number pad that keeps a wave profile rather than a split. The palm rest is cushioned memory foam and fixed in place, so the board is deeper front to back than a flat keyboard. Keys are spaced slightly closer than a standard board, which is the adjustment most buyers notice first. Logi Options+ handles customisation on Windows and macOS, while the keyboard's Easy-Switch pairs up to three devices with a 10 m range. The Lift on the mouse side is a 57-degree vertical shell with quiet clicks and a SmartWheel that toggles between notched and free-scroll.
Check the Wave Keys and Lift on Amazon
Pros
- One product, one receiver, two devices from a single USB port
- No meaningful learning curve
- The Lift is sized for smaller hands and has a left-hand version
- Long battery life on standard AA and AAA cells
Cons
- No negative tilt position
- The fixed palm rest makes the board deep
- Compact key spacing takes getting used to
- Membrane keys with no backlight
Verdict: nothing else packages two ergonomic pieces into one box with one dongle. The Wave Keys and Lift is the default recommendation for a first ergonomic setup.
Perfect for: a first ergonomic buy, small to medium hands, and desks with a single free USB port.
#2 Logitech ERGO K860 + Lift or MX Vertical: Negative Tilt and a Split Keyframe
| Attribute | Detail |
|---|---|
| Keyboard shape | Curved split keyframe, full-size with number pad |
| Tilt | Legs at 0, -4 and -7 degrees |
| Wrist rest | Fixed three-layer pillowed rest (0.5 mm fabric, 2 mm foam, 4 mm memory foam) |
| Keyboard size and weight | 17.95 x 9.17 x 1.89 in, 1160 g |
| Keys | Low-profile scissor switches, quiet, no backlight |
| Keyboard power | 2x AAA |
| Mouse options | Lift (57 degrees, small to medium) or MX Vertical (57 degrees, medium to large) |
| MX Vertical details | 4000 DPI, USB-C rechargeable, Unifying receiver or Bluetooth |
The K860 is the more demanding of the two mainstream Logitech boards: the key cluster splits left and right, and the tilt legs go negative to drop the front edge. It is a heavier, larger keyboard than the Wave Keys, at 1160 g and nearly 18 inches wide. The mouse side is where hand size decides the pick. The Lift is the small-to-medium fit with a 24-month AA battery, while the MX Vertical is the medium-to-large fit with a rechargeable USB-C battery. The pairing is described honestly as two products: at least one buyer reports the K860 on a Unifying receiver and the Lift on Logi Bolt, which means two dongles. Matching the K860 with the MX Vertical points to a single Unifying receiver, but Logitech has not confirmed the K860's receiver family, so treat the one-dongle outcome as likely rather than guaranteed.
Check the ERGO K860 on Amazon · Check the MX Vertical on Amazon
Pros
- Split keyframe with true negative tilt
- Full-size layout with a number pad
- Two mouse options to cover small, medium and large hands
- Quiet low-profile keys
Cons
- Heavier and wider than a wave board
- Receiver family unconfirmed, so a two-dongle setup is possible
- The fixed wrist rest needs depth
- No backlight
Verdict: the pick for anyone who wants a splittable keyframe and negative tilt in a mainstream board. Pair the ERGO K860 with the Lift for small hands or the MX Vertical for large ones.
Perfect for: medium to large desks, and buyers who want to keep one familiar layout while splitting the key groups.
#3 Logitech Wave Keys for Mac + Lift for Mac: The Mac Pairing
| Attribute | Detail |
|---|---|
| Keyboard shape | Curved wave with Mac-specific keys, cushion palm rest |
| Connectivity | Bluetooth only, no receiver listed |
| Mouse | Lift for Mac, vertical |
| Mouse fit | Small to medium hands |
| Battery | Not listed for the Mac versions |
| Color | Off-white |
This is the same wave design as the standard Wave Keys with Mac key legends, sold as a single Amazon bundle alongside the Mac-labelled Lift. Both pieces run over Bluetooth with no dongle, which suits a MacBook or iMac with limited ports and any desktop Mac. The pairing is Mac-optimised for macOS, iPadOS and MacBook, and the non-Mac Wave Keys and Lift combo also lists macOS 12+ support, so a Mac user who wants a receiver can take the standard kit instead. Battery and multi-device figures are not published for the Mac variants, so they behave as cable-free versions of the same hardware.
Check the Wave Keys for Mac and Lift for Mac on Amazon
Pros
- Native Mac key layout
- Bluetooth only, so no dongle
- Same wave shape and small-hand Lift fit as the standard kit
Cons
- Battery and multi-device specs not published for the Mac versions
- Receiver not included
- Every other ergonomic feature is identical to the standard combo
Verdict: the Wave Keys for Mac and Lift for Mac is the cleanest Mac-first pairing, and only worth choosing over the standard kit if you specifically want Mac legends and no dongle.
Perfect for: MacBook and iMac owners who want a matching wireless keyboard and mouse without adapters.
#4 Kinesis Freestyle Edge RGB+ + MX Ergo S: The Split Mechanical Tier
| Attribute | Detail |
|---|---|
| Keyboard shape | Split TKL, two modules on a 20 in cable, adjustable 12 to 21.5 in |
| Tenting | Lift Kit included, 5 / 10 / 15 degrees |
| Wrist support | Cushioned detachable palm supports included, zero-degree slope |
| Size and weight | 15.5 x 7.25 x 1.25 in, 3.6 lb |
| Switches | Mechanical, hot-swappable 3 and 5-pin MX style; Gateron v1 Brown 55 g or Red 45 g, 4.0 mm travel |
| Programming | SmartSet onboard, 4 MB, macros up to 300 characters, per-key RGB |
| Connectivity | Wired USB-A only, no Bluetooth |
| Mouse | MX Ergo S trackball, 20 degree tilt, 6 customizable buttons, USB-C, medium to large hands |
This is the enthusiast end of the list and the only mechanical split here. The two modules separate to shoulder width, the bundled Lift Kit tents them at 5, 10 or 15 degrees, and the palm supports come in the box, unlike the Freestyle2 where tenting is a separate purchase. Hot-swappable sockets accept both 3-pin and 5-pin MX-style switches, and per-key RGB plus onboard macros live in the keyboard rather than in software. The trade-offs are real: it is wired only, it needs a wide, deep desk, and the tenting angles only work with the palm supports installed. Paired with the MX Ergo S, the setup removes arm travel entirely, since the trackball is a 20-degree tilted, thumb-operated ball rather than a moving mouse.
Check the Freestyle Edge RGB+ on Amazon · Check the MX Ergo S on Amazon
Pros
- The only mechanical split in this roundup
- Tenting hardware included
- Hot-swappable switches and detachable palm supports
- Trackball removes arm movement
Cons
- Wired USB-A only, no wireless
- Two modules plus a cable need desk space
- Tenting depends on the palm supports
- Complex remaps need the Windows and macOS SmartSet app
Verdict: the Freestyle Edge RGB+ and MX Ergo S together are the most configurable pairing here, aimed at buyers who are past the adjustment phase and want to tune the layout.
Perfect for: split-mechanical users, tenting fans, and anyone willing to give up wireless for switch choice.
#5 Kinesis Freestyle2 + a Vertical Mouse: The Widest Split
| Attribute | Detail |
|---|---|
| Keyboard shape | Two key modules split to 9 in or 20 in, adjustable splay |
| Tenting | Optional: V3 lifters (5/10/15 degrees), VIP3 with palm supports, or Ascent for 20 to 90 degrees |
| Size | 15.4 x 7.1 x 0.9 in |
| Keys | Custom low-force membrane with tactile feedback, embedded number pad |
| Connectivity | Wired USB (PC or Mac), Bluetooth Blue models also listed |
| Multi-device | Not supported |
| Mouse options | Lift (small to medium), EM11 NL (under 7.5 in), MX Vertical (medium to large) |
The Freestyle2 is the cheapest way to fully separate the two halves of a keyboard. The modules sit at 9 or 20 inches apart and splay outward, and the embedded number pad keeps a full set of keys on one panel. Tenting is not included, which is the main difference from the Edge RGB+: you add V3 lifters, VIP3 supports or the Ascent system separately. It is a wired design with an optional Bluetooth variant, and it does not switch between devices the way the Logitech boards do. Because it is keyboard only, pair it with the vertical mouse that matches your hand, and check our guide to fitting a mouse to small or large hands before choosing.
Check the Kinesis Freestyle2 on Amazon · Check the ProtoArc EM11 NL on Amazon
Pros
- Widest split of any keyboard on this list
- Adjustable splay and optional tenting
- Lower entry cost than the mechanical Edge
- PC and Mac versions
Cons
- Tenting costs extra
- Wired, or Bluetooth with no multi-device switching
- No palm support unless you buy the VIP3 or Ascent accessories
- Long design history, so it feels dated next to the newer boards
Verdict: the Freestyle2 is for buyers whose priority is maximum separation between the hands, with the EM11 NL or a Lift as the mouse companion.
Perfect for: wide-shoulder setups and anyone who wants to separate the key halves without paying mechanical prices.
#6 ProtoArc EKM01 Plus: The Budget Full-Size Kit
| Attribute | Detail |
|---|---|
| Keyboard shape | Curved split keyframe, full-size, memory-foam wrist rest |
| Size | 20.75 in long x 11 in wide, adjustable tilt legs |
| Keys | Scooped non-mechanical keys, not backlit |
| Connectivity | Bluetooth or USB receiver, up to 3 devices |
| OS | Windows 7/8/10, Mac OS X 10.12, Android 4.3+ |
| Battery | 500 mAh Li-ion, USB-C, auto-sleep after 30 minutes |
| Mouse | Sculpted standard shell with palm and thumb rest, 2000 DPI, forward and back buttons |
The EKM01 Plus covers the full-size curved genre for a budget price: a split keyframe, a fixed memory-foam rest and adjustable tilt legs on a board that is over 20 inches wide. It pairs with a sculpted standard mouse rather than a vertical one, so it is the choice for a buyer who wants a curved keyboard but is not ready to change mouse shape. The related EKM02 goes compact instead, a wave layout with four tilt legs and a Windows/macOS switch, and it ships with the ProtoArc EM11 NL vertical mouse, which Logitech-style sizing places at hands under 7.5 inches with silent left and right buttons only.
Check the ProtoArc EKM01 Plus on Amazon · Check the EKM02 on Amazon
Pros
- Full-size split keyframe at a budget price
- Rechargeable USB-C on both devices
- Three-device pairing over Bluetooth or receiver
- Standard mouse shape for buyers who dislike vertical
Cons
- The keyboard is 20.75 inches wide
- Not backlit, and switch type is not specified beyond scooped keys
- No independent hands-on testing published
- Whether one or two receivers ship is not confirmed
Verdict: the EKM01 Plus is the budget route to a curved split board, with the EKM02 as the compact alternative that adds a vertical mouse.
Perfect for: cost-conscious buyers who want a full-size curved board and a familiar sculpted mouse.
#7 Perixx Periboard-612 + Perimice-713: The Budget Split
| Attribute | Detail |
|---|---|
| Keyboard shape | Split ergonomic layout with integrated palm rest |
| Size and weight | 485 x 236 x 43 mm, 987 g |
| Keys | Membrane, tactile, long travel |
| Connectivity | 2.4 GHz nano receiver (stored in keyboard) or Bluetooth 4.2 |
| Keyboard power | 2x AA |
| OS | Windows 7+, macOS Monterey 12.2+ fully |
| Mouse | Perimice-713 vertical, right-hand, 6 buttons |
| Mouse details | 800/1200/1600 DPI, 10 m range, 120 x 63 x 76 mm, 102 g, 2x AAA, marketed "for big hand" |
Perixx offers the cheapest true split here. The Periboard-612 keeps a split layout with an integrated palm rest and runs on 2.4 GHz or Bluetooth, though only one device per mode. The Perimice-713 is a right-hand vertical mouse with a 10 m range that Perixx markets for big hands, though some buyers describe it as small, so it is worth checking against your own hand before buying. The two devices use separate nano receivers, one stored in the keyboard and one in the mouse. If you prefer a single receiver, the wired Periboard-512 variant and the rechargeable Periduo-614US keep the same split-and-vertical concept, and the 614US ships one 2-in-1 nano receiver with a full-size board and a USB-C rechargeable vertical mouse.
Check the Perixx Periboard-612 bundle on Amazon · Check the Periduo-614US on Amazon
Pros
- The lowest-cost split keyboard here
- Mouse and keyboard both covered in one bundle
- Wired and rechargeable variants exist
- Periduo-614US pairs both to one 2-in-1 receiver
Cons
- Separate receivers on the 612 bundle
- Keyboard-only rating sits below 4.0 in the standalone listing
- Mouse hand-fit is disputed between the maker and some buyers
- No independent testing of the exact bundle
Verdict: the Periboard-612 and Perimice-713 are the budget entry to a real split layout, and the Periduo-614US is the tidier single-receiver version.
Perfect for: first-time split users on a tight budget, and big hands drawn to the Perimice-713 claim.
#8 Kensington Pro Fit Ergo KM675 EQ: The Budget All-in-One
| Attribute | Detail |
|---|---|
| Keyboard shape | Compact curved TKL with built-in wrist pad, front legs |
| Size | 14.8 x 8.7 x 1.4 in |
| Keys | Low-profile membrane |
| Connectivity | Up to 3 devices: two Bluetooth plus one 2.4 GHz USB-A receiver, 10 m, 128-bit AES |
| Battery | Built-in 500 mAh rechargeable in both devices, USB-C |
| Mouse | MY630 full-size vertical, left/right/forward/back/scroll, silent switches |
| Mouse DPI | 1000/1600/2400 switchable |
A single-SKU kit that ships a compact curved TKL keyboard and a full-size vertical mouse together. Both devices are USB-C rechargeable, both carry 500 mAh batteries, and the set connects up to three devices with two Bluetooth slots plus one receiver. The mouse is a plain vertical shell with silent switches rather than a sculpted gaming shape, and the keyboard's built-in wrist pad and front legs give a mild negative posture without a split. Availability is limited, so this is a buy when you want one box and one price rather than the best-built option.
Check the Kensington Pro Fit Ergo KM675 EQ on Amazon
Pros
- Single-SKU kit, keyboard and mouse together
- Rechargeable USB-C on both devices
- Three-device pairing with two Bluetooth slots
- Silent mouse switches
Cons
- Limited stock
- Thin review base on the set
- Curved compact layout causes some mistypes
- Older Kensington ergonomic kits are a different design
Verdict: the KM675 EQ is a one-box budget option, best understood as an entry kit rather than a long-term investment.
Perfect for: buyers who want a bundled curved board and vertical mouse and will accept limited stock and a short track record.
#9 Logitech MX Keys S + MX Master 4: Sculpted, Not Split
| Attribute | Detail |
|---|---|
| Keyboard shape | Straight full-size, laptop-like keys, smart backlighting |
| Ergonomics | Not split or tented; optional palm rest in some SKUs |
| Connectivity | Bluetooth LE or Logi Bolt, up to 3 devices |
| OS | Windows, macOS, Linux |
| Power | Rechargeable |
| Mouse | MX Master 3S in the combo, or MX Master 4 |
| MX Master note | MX Master 4 replaced the 3S as the top ergonomic mouse pick in January 2026; 125 Hz polling cap |
This is the "comfort, not ergonomic-shaped" route. The MX Keys S is a flat, straight, backlit keyboard with no split and no tenting, so it does nothing for forearm rotation. What it offers is a familiar layout, multi-device switching and rechargeable power in both pieces. The mouse is a sculpted standard rather than a vertical shell, and the MX Master 4, which replaced the MX Master 3S at the top of the ergonomic rankings in January 2026, suits a wider range of hand sizes than its predecessor. Its polling is capped at 125 Hz, which is fine for work and not a gaming mouse. Choose this pair when the keyboard shape is not the problem and hand fit on a standard mouse is.
Check the MX Keys S Combo on Amazon · Check the MX Master 4 on Amazon
Pros
- Familiar straight layout and full-size keys
- Rechargeable and multi-device on both pieces
- Sculpted standard mouse that suits a wide hand range
- No adjustment to a split or vertical shape
Cons
- No split, tenting or negative tilt
- Straight board does not change forearm rotation
- MX Master 4 polling is capped at 125 Hz
- Gesture and haptic features depend on Options+ software
Verdict: the MX Keys S and MX Master 4 are for buyers who want quiet multi-device comfort and a sculpted mouse rather than a true ergonomic reshape.
Perfect for: office and home users who like a standard layout and will not change mouse shape.
Comparison Table
| Combo | Keyboard shape | Connection | Mouse | Hand fit | Wired |
|---|---|---|---|---|---|
| Logitech Wave Keys and Lift | Curved wave | One Logi Bolt, Bluetooth | Lift vertical | Small to medium | No |
| Logitech ERGO K860 + Lift / MX Vertical | Split keyframe | USB receiver and Bluetooth (family unconfirmed) | Lift or MX Vertical | Small-medium / medium-large | No |
| Wave Keys for Mac + Lift for Mac | Curved wave | Bluetooth only | Lift for Mac | Small to medium | No |
| Kinesis Freestyle Edge RGB+ + MX Ergo S | Fully split mechanical | Wired USB-A, Bolt for trackball | MX Ergo S trackball | Medium to large | Yes |
| Kinesis Freestyle2 + vertical mouse | Fully split membrane | Wired USB, Bluetooth Blue models | Lift / EM11 NL / MX Vertical | Match to mouse | Wired |
| ProtoArc EKM01 Plus | Curved split full-size | USB receiver or Bluetooth | Sculpted standard | Standard | No |
| Perixx Periboard-612 + Perimice-713 | Split membrane | 2.4 GHz or Bluetooth 4.2 | Perimice-713 vertical | Big hands per maker | No |
| Kensington Pro Fit Ergo KM675 EQ | Curved compact TKL | 2 Bluetooth plus 1 receiver | MY630 vertical | Larger hands | No |
| Logitech MX Keys S + MX Master 4 | Straight | Bluetooth or Logi Bolt | MX Master 4 sculpted | Wider range | No |
Which Ergonomic Keyboard and Mouse Combo Should You Buy?
Match the purchase to the problem you are actually solving.
- First ergonomic setup with no learning curve: the Wave Keys and Lift, because it is the only single-product kit with one shared receiver and a small-to-medium Lift.
- You want a split keyframe and negative tilt in one mainstream board: the ERGO K860 with the Lift for small hands or the MX Vertical for large ones.
- You use a Mac and want no dongle: the Wave Keys for Mac and Lift for Mac.
- You want mechanical switches and included tenting: the Kinesis Freestyle Edge RGB+ with the MX Ergo S.
- Widest possible split on a budget: the Kinesis Freestyle2 paired with the EM11 NL or a Lift.
- Cheapest true split: the Perixx Periboard-612 bundle, or the Periduo-614US if one receiver matters.
- One box and one price: the Kensington KM675 EQ.
- You want a standard layout and only the mouse to change: the MX Keys S with the MX Master 4.
- Large hands: pair a Kinesis board with the MX Vertical rather than the Lift, and cross-check with our roundup of mice for big hands.
One practical note: the Microsoft Sculpt Ergonomic Desktop is discontinued, and Amazon now shows it only through reseller listings at inflated prices, so it is not a current buyable pick. A wave keyboard with a sculpted standard mouse also exists as the Logitech Wave Keys MK670 bundle, but its mouse is single-computer only and cannot switch between PCs.
Frequently Asked Questions
Q: Is a split mechanical keyboard worth the extra cost over a membrane one?
The mechanical tier here is one product, the Kinesis Freestyle Edge RGB+ (KB975), and it is wired only with no Bluetooth. What it adds over the membrane boards is hot-swappable 3- and 5-pin MX-style switches, per-key RGB, and 4 MB of onboard programming with macros up to 300 characters. The membrane split and curved boards are quieter, cheaper, and either wireless or single-cable, so the mechanical pick only pays off if you want to change switches and program on the board itself.
Q: Will the keyboard and mouse share one USB receiver?
Only when both devices sit in the same wireless ecosystem. The Wave Keys and Lift combo ships one Logi Bolt receiver that drives both. A K860 paired with a Lift can need two dongles, because the receiver families differ, and the K860's family is not confirmed by Logitech. Matching ecosystems, or moving one device to Bluetooth, removes the second dongle.
Q: Does hand size matter for the keyboard too?
Less than for the mouse. Keyboard shape is chosen by how much adjustment you will accept: curved needs none, split keyframe needs a little, fully split takes a few weeks. Hand size mainly decides the mouse. Board width still matters on the desk, since the K860 is 17.95 inches wide and the ProtoArc EKM01 Plus is 20.75 inches, so check the footprint against your keyboard tray before buying.
Conclusion
The Logitech Wave Keys and Lift stays the pick for most buyers because it solves the practical problem a combo is supposed to solve: two ergonomic pieces, one receiver, one box, and no re-learning to type. It is the only major-brand kit that does all three.
Step up to the ERGO K860 if you want a split keyframe and real negative tilt, or to the Kinesis Freestyle Edge RGB+ if you want a mechanical split with tenting in the box. If hand fit is the bigger issue, spend the budget on the mouse instead and read our best ergonomic mouse picks and the separate vertical mouse roundup before choosing a keyboard. Buyers who want to approach the whole category from the comfort angle rather than the hardware angle will find the broader reasoning in our wrist and forearm comfort guide.
