Keychron K3 Ultra 8K Red Switch RGB (ISO-CH)

Keychron K3 Ultra 8K – flat ISO-CH keyboard with 8000 Hz wireless

Ideal for beginners

The Keychron K3 Ultra 8K combines a compact 75% format with a pleasantly flat low-profile design and the familiar Swiss ISO-CH layout. At 320.62 × 126 mm, it takes up little space on the desk and is equally suitable for the home office, office and gaming. It is connected via 2.4 GHz wireless, Bluetooth 5.2 or USB-C - exactly as it suits the setup. Up to three devices can be connected via Bluetooth and easily swapped. The linear Keychron Milk POM Red Low-Profile Switches are pleasantly smooth at 45 ± 10 gf and do not require any noticeable tactile resistance. With a delay of 1.3 ± 0.4 mm and a maximum of 3.1 ± 0.3 mm total travel, they react quickly and feel smooth. The switches are already pre-lubricated. This is particularly noticeable during longer typing sessions or fast gaming inputs.

For IT professionals & enthusiasts

This is where it gets technically exciting: In wired USB-C and 2.4 GHz mode, the K3 Ultra 8K works with a polling rate of 8000 Hz. It is 125 Hz via Bluetooth. N-Key Rollover is available both wired and wireless. An ARM architecture with 1 MB of flash memory works inside. The open ZMK firmware allows extensive adjustments. The Keychron Launcher web app can be used to reassign keys, configure macros and shortcuts, and adjust other settings. This means that the keyboard is not nailed to its factory settings – if you like to tinker with your own layout, you get a lot of leeway.

2.4 GHz & Bluetooth Connection

The K3 Ultra 8K achieves a polling rate of 8000 Hz via the ultra-fast 2.4 GHz connection, making it suitable for fast games. The same 8000 Hz is available via the wired USB-C connection. Bluetooth 5.2 complements the whole thing for uncomplicated use with up to three devices.

550 Hours of Use on a Single Charge

The integrated 2600 mAh lithium polymer battery achieves up to 550 hours of runtime when the backlight is turned off. And if the battery does run out? Simply continue working via cable while the keyboard charges.

Wood Meets Metal

Visually, the K3 Ultra 8K takes an unusual approach. The cabinet combines natural wood with aluminum and thus clearly stands out from classic plastic keyboards. The plate is made of anodized aluminum alloy, while ABS plastic is used for the bottom case. The weight is 566 ± 10 g.

Ultra-Slim

The low-profile construction keeps the keyboard pleasantly flat. Without keycaps, the front height is 16.55 mm and the back height is 20.1 mm. The feet are 2 mm high. The Milk POM low-profile switches themselves measure only 11.9 mm. The result is a slim mechanical keyboard that remains comfortably accessible even without a massive wrist rest.

Keychron Milk POM Switch

Linear Keychron Milk POM Red switches are installed in this version. The MX stem consists of POM, upper housing and base also made of POM; in addition, there is a spring made of steel. The self-lubricating POM and POK materials as well as the factory lubrication ensure smooth button movements. The Red variant has 45 ± 10 gf actuation force, 1.3 ± 0.4 mm travel and a maximum of 3.1 ± 0.3 mm total travel. Its linear behavior and low noise level are well suited to gaming and office.

Hot-Swappable

Tired of the Red Switches? Thanks to hot-swap, compatible Keychron Milk POM switches can be exchanged without soldering. This means that the typing feel can be adjusted later without having to put a new keyboard on the table.

An Epic Core Inside

The ARM-based MCU has 1 MB of flash memory and forms the technical basis for the extensive customization options. At the same time, it enables the polling rate of 8000 Hz over 2.4 GHz and USB-C for particularly short input delays.

Interior Acoustic Foam

Inside, Keychron relies on IXPE acoustic foam as well as durable EPDM foam. This construction dampens unwanted noise, supports the switches and contributes to a controlled, comfortable typing experience.

Customize Every Part

The K3 Ultra 8K is designed for customizability. Switches, keycaps and other components can be changed or adapted to personal requirements. This makes the keyboard interesting for those who don't want to leave their setup in the original state forever.

Low-Profile Double-Shot PBT Keycaps

The flat LSA Double-Shot PBT keycaps are resistant to wear and tear and finger grease. The lettering is not translucent, so the keycaps are non-shine-through. Under the keys there is north-facing RGB lighting.

Mix RGB

With Mix RGB, the keyboard can be divided into two individually configured lighting zones. Different effects and combinations can be set via the Keychron launcher – practical for those who like to add a little more color to the setup.

Suitable for All Devices

The K3 Ultra 8K supports macOS, Windows, and Linux. Additional Mac and Windows keycaps are included, so the labeling can be customized to match the operating system you're using.

Program with ZMK & Launcher

The open-source firmware ZMK forms the basis for programming. The browser-based Keychron Launcher web app can be used to reassign individual keys and set up macros, shortcuts and other functions.

Scope of Delivery

• 1× Keychron K3 Ultra 8K, fully assembled
• 1× USB-C cable
• 1× USB-A to USB-C adapter
• 1× Type-A 2.4GHz receiver
• 1× Extension adapter for the receiver
• 1× additional keycap set
• 1× Keycap and Switch Puller
• 1× Instruction manual
• 1× Quick Start Guide

Conclusion & Recommendation

The Keychron K3 Ultra 8K Red Switch RGB (CH) brings together some unusual combinations: 75% layout, Swiss ISO-CH lettering, ultra-slim mechanical switches, 8000 Hz wireless, hot-swappable, and a wood and aluminum chassis. The Milk POM Red linear switches are particularly suitable for users who like smooth inputs without tactile resistance. If you're looking for a flat, fast, and versatile ISO-CH keyboard, then you can't go wrong with the Keychron K3 Ultra 8K. Target Audience: Gamers, Frequent Typers, Developers, Low-Profile Fans, Minimalists, Enthusiasts