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Head to head · Prices checked Oct 21, 2026

Jamesdonkey A3 vs MMD KM40

Get the Jamesdonkey A3 for the 3,000 mAh battery and knob.

What actually differs

The differences that matter

Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.

Jamesdonkey A3

MMD KM40

  • Layout size

    75%

    40%

  • Battery

    3,000 mAh

    2,000 mAh

  • Case material

    ABS, PBT, Plastic, Polycarbonate

    Aluminum

  • Switch options

    Clicky, Linear, Tactile

    Linear, Tactile

  • Knob

    Yes

    No

KeebFinder scores

How we score
  • Jamesdonkey A3
  • MMD KM40
Performance
62
61
Build quality
66
83
Productivity
91
69
Customizability
85
84
Portability
79
84

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Mount style: Gasket Mount
  • Sound dampening
  • Plate material: Polycarbonate
  • Keycaps: PBT
See every spec side by side

From real owners

What owners say

Ratings and quotes collected from verified store reviews, including the critical ones.

Jamesdonkey A3

No owner reviews collected yet.

MMD KM40

5.0

4 owner reviews

Praise
“Keycaps are dyesub, but still PBT Tactile switches feature a proper tactile feeling with great typing experience The case feels and looks really premium layer activation could be nicer but in the end you just gotta get used to the board”
Andi· via MonacoKeys

Full specs

Jamesdonkey A3 vs MMD KM40 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

13 of 25 specs differ

Jamesdonkey A3

MMD KM40

Typing & switches

Switch options

Clicky, Linear, Tactile
Linear, Tactile

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
Gasket Mount

Sound dampening

Yes
Yes

Screw-in stabilizers

Yes
No

Layout

Layout size

75%
40%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
None

Media keys

Yes
No

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Battery

3,000 mAhBetter
2,000 mAh

USB-C

Yes
Yes

Build & materials

Case material

ABS, PBT, Plastic, Polycarbonate
Aluminum

Plate material

Polycarbonate
Polycarbonate

Keycaps

PBT
PBT

Weight

1,000 g
620 g

Dimensions

40 x 136 x 321 mm
—

Backlight

RGB
RGB

Firmware & software

QMK

No
Yes

VIA

No
Yes

N-key rollover

Yes
No

Mac & Windows

Yes
No

Extras

Released

2022
2026

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Lowest price across stores, Amazon excluded.

  • MechkeysCN

    In stock
    $89Visit
  • AmazonGlobal

    Check price
    ~$89Visit
  • WhatGeekCN

    Out of stock
    $89Visit
MMD KM402 stores
  • MonacoKeysDE

    In stock
    $84Visit
  • AmazonGlobal

    Check price
    ~$84Visit

Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.

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