K Ultra
2.4 GHz
Bluetooth 5.2
Wired
EVA Foam
IXPE Foam
PET Film
EPDM Foam
Bottom Case PET Film
Silicone Bottom Pad
Keychron Apex Switch
OSA Double-Shot PBT Keycaps
Up to 600 hours
ZMK
8000 Hz
1 MB
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Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard
SKU:
KEYC-K4U-H3
Regular price
$249.90
Unit price
Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard - Fully Assembled / Black / Keychron Apex Switch Brown is backordered and will ship as soon as it is back in stock.
Keychron K4 Ultra 8k is a wireless custom mechanical keyboard with a sleek, durable build. It supports 2.4 GHz, Bluetooth, and wired connections. Through the Keychron Launcher web app, users can remap keys and create macro commands on its 96% compact layout. Powered by ZMK firmware, it enables an 8K polling rate in wireless mode while delivering up to 600 hours of battery life. It is also fully compatible with Windows, macOS, and Linux.
Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard - Fully Assembled / Black / Keychron Apex Switch Brown is backordered and will ship as soon as it is back in stock.
KEYCHRON K4 ULTRA 8K
The K4 Ultra 8K is a wireless mechanical keyboard with a 96% layout. It delivers an ultra-responsive experience with an 8000 Hz polling rate in both wired and wireless modes. Supporting Bluetooth, wired, and ultra-low-latency 2.4 GHz connectivity, it adapts seamlessly to any setup. Powered by the open-source ZMK firmware, it unlocks endless customization possibilities while delivering up to 600 hours (8K, backlit off) of battery life for enhanced performance in both work and gaming.
COLOR
Minimalist Style
Precision
Tri-Mode Connectivity
Unlock the power of an 8000 Hz polling rate in both wired and 2.4 GHz wireless modes, delivering ultra-responsive, pro-grade precision for competitive gaming. With Bluetooth 5.2, you can seamlessly switch between up to three devices for effortless multitasking. From lightning-fast performance to versatile wireless connectivity, the K4 Ultra 8K does it all. Learn how to switch your keyboard to 8000 Hz polling rate
Worry-Free Power
Up to 600 Hours of Wireless Endurance
With a 4000 mAh battery, optimized firmware, and an enhanced circuit design, the K4 Ultra 8K delivers up to 600 hours of use at an 8000 Hz polling rate with the backlight turned off, redefining what wireless performance can achieve.
Powerful ARM Core
An Epic Core Inside
Inside the K4 Ultra 8K lies a powerful MCU with 1 MB flash, delivering unmatched flexibility for deep customization and advanced functionality. It achieves an ultra-responsive 8K polling rate, ensuring every keystroke is registered with near-zero latency and exceptional accuracy for the most demanding gaming and professional tasks.
Layout
96% Compact Layout
The 96% compact layout keeps the full-size keyboard experience in a more space-efficient form. It retains the essential function row, arrow keys, and numeric keypad while reducing unnecessary gaps, giving you more room on your desk without sacrificing productivity. Whether you're handling spreadsheets, typing long documents, coding, or gaming, it delivers a practical balance of familiar control, efficient workflow, and everyday comfort in a streamlined footprint.
Design
From Productivity to Play, Instantly
The K4 Ultra 8K transitions effortlessly between work and play. During the day, its 96% compact layout gives you a full-size typing experience with a numeric keypad while saving valuable desk space for coding, writing, spreadsheets, and focused tasks. When it’s time to unwind, the 8000 Hz polling rate and ultra-low-latency wireless connection provide the speed and precision needed for smooth gameplay. One keyboard, built for every part of your day.
Switch
Keychron Apex Switch
The K4 Ultra 8K comes with pre-lubed Keychron Apex Switches, crafted for gamers and typists who demand precision, durability, and a refined typing experience. The switch stem features a reinforced wall structure that enhances stability for smoother, wobble-free keystrokes and helps prevent dust and moisture from entering the switch housing for long-lasting performance.
Customize
Hot-swappable
Since everyone has unique typing preferences, the K4 Ultra 8K features a hot-swappable switch design, allowing you to easily swap switches in seconds and customize your experience—no soldering required.
Keycaps
Double-Shot PBT Keycaps
Designed for a premium typing experience, the K4 Ultra 8K features double-shot PBT keycaps made from durable, non-shine-through PBT material. With excellent oil resistance, they are built to maintain a clean, refined look over the long term.
Customize
SUITABLE FOR ALL DEVICES
The K4 Ultra 8K is seamlessly compatible with both macOS and Windows, including dedicated keycaps for each system to deliver a consistent and intuitive typing experience across devices.
Customize
Customize Every Part
To make the keyboard fully customizable, we designed each component to be easy to assemble, adjust, and personalize.
Keycaps
The double-shot PBT keycaps provide excellent oil resistance while preventing the legends from fading over time.
Top Case
A lightweight, rigid polymer body for easy portability and a dampened typing experience.
Switches
Switches are the core mechanical components; different types (linear/tactile) offer unique feel and sound.
Plate
The steel plate in a keyboard secures switches in place, provides structural support, and influences typing feel and sound.
EVA Foam
By absorbing echo and noise, the EVA foam produces a cleaner typing sound.
IXPE Foam & PET Film
The IXPE foam reduces keystroke vibration and optimizes typing sound, while the PET film provides insulation and dust protection.
PCB
The circuit board registers keystrokes, and its hot-swappable design enables easy switch replacement.
EPDM Foam
The EPDM foam effectively dampens vibrations and minimizes hollow sounds, providing a softer, more cushioned typing experience.
Bottom Case PET Film
The bottom case PET film helps prevent short circuits, protects internal components from dust and scratches, and provides minor dampening.
Silicone Bottom Pad
This silicone pad helps reduce vibration and noise and provides a cushioned typing feel.
Bottom Case
The solid, premium ABS bottom case provides a quieter, vibration-free typing experience.
LAUNCHER WEB APP
Program with ZMK & Launcher
The open-source ZMK firmware means endless possibilities for key remapping, macros, shortcuts, and more. Now you can easily customize each key with the Keychron Launcher web app. With its built-in AI assistant (live in beta now), keyboard customization is no longer complicated — just ask in plain language, and AI handles the rest.
Backlight
Unlock Dynamic Backlit Control
Go beyond standard presets with 22+ RGB backlight settings — including a static white option. Our advanced lighting engine includes two powerful features to fuel your creativity: Per-key RGB and Mix RGB. You can further fine-tune and remap keys with ease, crafting your unique style with vivid, dynamic RGB control.
RGB Backlight
Per-key RGB
With Per-key RGB, every single key is a digital brushstroke. This feature lets you individually customize the color of each key, transforming your keyboard into a vibrant canvas.
Learn how to set Per-key RGB on Launcher
Customize
Mix RGB
With Mix RGB, you can split your keyboard into two custom lighting zones, each with unique effects. Design high-contrast combinations to make your entire setup pop with vibrant style.
Learn how to set Mix RGB on Launcher
Guide
What's in the Box?
Guide
Series Differences
K Max
2.4 GHz
Bluetooth 5.1
Wired
Sound-Absorbing Foam
IXPE Foam
PET Film
EPDM Foam
Bottom Case PET Film
Silicone Bottom Pad
Keychron Super Switch
OSA Double-Shot PBT Keycaps
Up to 190 hours
QMK
1000 Hz
256 KB
K Pro
Bluetooth 5.1
Wired
Sound-Absorbing Foam
Silicone Bottom Pad
Keychron K Pro Switch
OSA Double-Shot PBT Keycaps
Up to 260 hours
QMK
1000 Hz
128 KB
Precision
Specs
Product Information
Size
391.29 x 140.27 mm
Front Height
23.83 mm (without keycaps)
Back Height
30.87 mm (without keycaps)
Bottom Case Material
ABS
Feet Height
1.2 mm
Weight
1241g ± 10g
Body Material
ABS
Keycap
OSA Double-Shot PBT Keycaps
Plate Material
Steel
Switch
Keychron Apex Switch
Stabilizer
Screw-in PCB Stabilizer
Backlight
South-facing RGB LED
Battery
4000 mAh Rechargeable Lithium Polymer Battery
Compatible System
macOS / Windows / Linux
Operating Environment
-10 to 50℃
Performance
Connectivity
2.4 GHz / Bluetooth 5.2 / Type-C Wired
Polling Rate
8000 Hz (Wired & 2.4GHz)
125 Hz (Bluetooth)
125 Hz (Bluetooth)
N-Key Rollover (NKRO)
Yes (wireless & wired)
Wireless Working Time
Up to 600 hours (8K, backlit off)
Hot-swappable
Yes
Bluetooth Device Name
Keychron K4 Ultra 8K
