Keychron
Keychron K5
Released 2021
Researched from maker specs and published sources. Last checked Oct 18, 2026.
K5, from Keychron's store
The K5 Ultra-Slim is the aluminum-and-plastic version of the SE slim full-size at about 770 g, with LSA ABS keycaps and a 90-hour battery rating.
Sources
Our take, based on research
An alternative to the SE with a mixed case. Evidence is thin.
Overview
The K5 Ultra-Slim shares the SE's slim full-size design. Keychron lists a 100% ANSI layout, Bluetooth plus wired at 1000 Hz, hot-swappable low-profile Gateron mechanical or Keychron optical switches, an aluminum-and-plastic tray-mount case, LSA ABS keycaps that are not shine-through, a four-level backlight, a 2000 mAh battery rated up to 90 hours, about 770 g and 435 x 120 mm.
No review of this specific model was found. The family-level reviews (Forbes on the K5 Pro, GameRevolution on the K5 Max) praise the slim numpad idea, with GameRevolution's main complaint being non-shine-through keycaps, which this model also uses.
It is heavier than the SE by about 100 g and has a mixed aluminum and plastic case in place of the SE's all-aluminum listing.
Pros & Cons
- Slim full-size with a numpad (maker)
- Optical or mechanical low-profile switches
- Hot-swappable
- Aluminum-and-plastic tray-mount case
- Bluetooth plus wired
- Heavier than the SE at about 770 g
- Battery rated at only 90 hours
- Non-shine-through ABS keycaps
- No dongle
- No review of this model was found
Who Is This For?
- Office users who want a slim full-size board
- Buyers who want optical switch options
- People who value Bluetooth multi-device pairing
- Anyone who wants a lighter case (see the SE)
- Gamers who want 2.4 GHz
- Buyers who need verified reviews of this exact model
Where to Buy
Dimensions
435 x 120 mm
Weight
770 g +/- 10 g
Case Material
Aluminum & Plastic
Connectivity
Both
Plate Options
Case Colors
Software Support
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