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Head to head · Prices checked Nov 1, 2026

Jamesdonkey RS2 4.0 vs Redragon UCAL K673 Pro

Get the Jamesdonkey RS2 4.0 for qmk and media keys.

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Quick verdict

Which one should you get?

Get the

Jamesdonkey RS2 4.0

QMK

Build quality in the top 40% of 96% boards under $100.

Rules this board out

  • Compact full-size layout. The numpad is present, the gaps of a full-size board are not.
$99 at Mechkeys

Get the

Redragon UCAL K673 Pro

Build quality in the bottom 45% of 75% boards under $100.

Rules this board out

  • No numpad.
$64 at Redragon

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 RS2 4.0

Redragon UCAL K673 Pro

  • Layout size

    96%

    75%

  • Case material

    Aluminum

    Plastic

  • Weight

    1,150 g

    1,200 g

    Heavier boards stay planted and lighter ones travel

  • QMK

    Yes

    No

    The deep option when you want to remap every key

  • Media keys

    Yes

    No

KeebFinder scores

How we score
  • Jamesdonkey RS2 4.0
  • Redragon UCAL K673 Pro
Performance
58
65
Build quality
71
62
Productivity
93
69
Customizability
82
58
Portability
53
75

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • Battery: 4,000 mAh
  • Switch options: Linear
  • Mount style: Gasket Mount
  • Knob
See every spec side by side

Full specs

Jamesdonkey RS2 4.0 vs Redragon UCAL K673 Pro specs

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

8 of 21 specs differ

Jamesdonkey RS2 4.0

Redragon UCAL K673 Pro

Typing & switches

Switch options

Linear
Linear

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
Gasket Mount

Sound dampening

Yes
Yes

Layout

Layout size

96%
75%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
Yes

Display

None
None

Media keys

Yes
No

Connectivity & battery

Connection

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

Battery

4,000 mAh
4,000 mAh

USB-C

Yes
Yes

Build & materials

Case material

Aluminum
Plastic

Keycaps

PBT
PBT

Weight

1,150 g
1,200 g

Dimensions

34 x 405 x 138 mm
37 x 335 x 37 mm

Backlight

RGB
RGB

Firmware & software

QMK

Yes
No

Mac & Windows

Yes
No

Extras

Released

2024
2023

Where to buy

Compare prices

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

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.

Lowest price across stores, Amazon excluded.

Jamesdonkey RS2 4.03 stores
Redragon UCAL K673 Pro2 stores

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