What connectivity options does the Keychron K4 Ultra support?

The Keychron K4 Ultra offers versatile connectivity options including 2.4 GHz wireless, Bluetooth, and wired USB connection. This allows you to easily switch between devices and enjoy a stable connection whether you're gaming, working, or typing.

Can I customize the key functions on this keyboard?

Yes, the keyboard supports extensive customization through the Keychron Launcher web app. You can remap any key and create complex macro commands, enabling you to tailor the keyboard layout to your exact workflow or gaming preferences.

How does the 96% layout of this keyboard benefit me?

The 96% compact layout combines most of the keys found on a full-sized keyboard into a smaller footprint, saving desk space without sacrificing functionality. It includes a number pad and arrow keys while maintaining a sleek and portable design.

What kind of battery life can I expect from the K4 Ultra?

Thanks to efficient power management, the keyboard can deliver up to 600 hours of battery life on a single charge when used wirelessly. This means you can enjoy long periods of uninterrupted typing or gaming without frequently recharging.

Is this keyboard compatible with different operating systems?

Absolutely. The keyboard is fully compatible with Windows, macOS, and Linux, ensuring seamless integration regardless of your preferred operating system. It also supports OS-specific key functions and shortcuts.

What firmware does the keyboard use and why is it important?

The Keychron K4 Ultra runs on ZMK firmware, which is known for its flexibility and performance. This firmware allows high polling rates up to 8K in wireless mode, resulting in ultra-responsive key inputs and a smooth typing experience.

How durable is the build quality of this mechanical keyboard?

The keyboard features a robust and sleek design made from high-quality materials to withstand heavy use. Its custom mechanical switches are designed for longevity, providing satisfying tactile feedback and durability over millions of keystrokes.

Can I use the keyboard with multiple devices at the same time?

Yes, with its multi-mode wireless support, you can pair the keyboard with multiple devices and switch between them seamlessly. This is particularly useful if you work across a laptop, tablet, and desktop.

Keychron K4 Ultra Starting at $113.99

Name: Keychron K4 Ultra
Brand: Keychron
SKU: keychron-k4-ultra-8k-96-wireless-keyboard

Vendor	Location	Coupon Code	In Stock	Price (USD)	Link*
Keychron K4 Ultra 8K Wireless Mechanical...
	Global	-	Check vendor	Check vendor	Check price
Keychron K4 Ultra 8K 96% Wireless Keyboard
	Based in US	-		$119	Visit Shop
Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard
	Shipping to US	-		$114	Visit Shop
Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard (US ANSI Layout)
	No shipping to US			$150	Visit Shop

Vendor

Location

Coupon Code

In Stock

Price (USD)

Link*

Keychron K4 Ultra 8K Wireless Mechanical...

Global

Check vendor

Check price

Keychron K4 Ultra 8K 96% Wireless Keyboard

Based in US

$119

Visit Shop

Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard

Shipping to US

$114

Visit Shop

Keychron K4 Ultra 8K Wireless Custom Mechanical Keyboard (US ANSI Layout)

No shipping to US

$150

Visit Shop

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Compare Keychron K4 Ultra vs Epomaker RT100 Pro vs Royal Kludge S98 ES Specification

Compare similar keyboards side by side, or use the comparison table to compare all keyboards!

Model	Keychron K4 Ultra	Epomaker RT100 Pro	Royal Kludge S98 ES
	75	74	79
Rating	5.0 stars (1 reviews)	4.0 stars (6 reviews)	0.0 stars (0 reviews)
Purchase Options
Main differences	Has Linear, Tactile, Clicky switch options Includes a No display Provides dedicated media keys Uses a Plate Mount mounting style Runs at a 8000 Hz polling rate Equipped with a 4000 mAh battery Weighs about 1241 g Sized at 31 x 391 x 140 mm Made with a ABS case Offers Yes, Rgb, White, South-face, Rgb South-face, White South-face RGB lighting	Has Linear, Silent switch options Includes a Yes, TFT display Uses a Gasket Mount mounting style Runs at a 1000 Hz polling rate Equipped with a 5000 mAh battery Weighs about 1300 g Sized at 45 x 433 x 142 mm Made with a ABS, Plastic case Offers Yes, Rgb, South-face, Rgb South-face RGB lighting	Released in 2025 Includes a Yes, LCD display Offers a USB passthrough port Uses a Top Mount mounting style Equipped with a 3750 mAh battery Weighs about 1879 g Sized at 42 x 409 x 140 mm Features ABS keycaps Offers Yes, Rgb RGB lighting
Score	Scores Performance: 88.1 Build Quality: 63.5 Productivity: 86.5 Customizability: 75.2 Portability: 56.9	Scores Performance: 68 Build Quality: 66.7 Productivity: 83.9 Customizability: 74.9 Portability: 56.6	Scores Performance: 77.9 Build Quality: 70 Productivity: 90.8 Customizability: 79.3 Portability: 56.7
Name	Name Keychron K4 Ultra	Name Epomaker RT100 Pro	Name Royal Kludge S98 ES
Release year	Release year 2026	Release year 2026	Release year 2025
Switch Options	Switch Options Linear, Tactile, Clicky	Switch Options Linear, Silent	Switch Options -
Profile	Profile Normal Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size 96%	Layout Size 96%	Layout Size 96%
Layout Standard	Layout Standard ANSI	Layout Standard ANSI	Layout Standard ANSI
Layout Ergonomics	Layout Ergonomics Normal	Layout Ergonomics Normal	Layout Ergonomics Normal
Knob Support	Knob Support	Knob Support	Knob Support
Display Support	Display Support	Display Support TFT	Display Support LCD
Mac/Win Support	Mac/Win Support	Mac/Win Support	Mac/Win Support
Multi-Media Keys	Multi-Media Keys	Multi-Media Keys	Multi-Media Keys
USB-C	USB-C	USB-C	USB-C
USB passthrough	USB passthrough	USB passthrough	USB passthrough
Connection	Connection Bluetooth, 2.4 GHz, Wired, Wireless	Connection Bluetooth, 2.4 GHz, Wired, Wireless	Connection Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate	Polling Rate 8000 Hz	Polling Rate 1000 Hz	Polling Rate -
Battery capacity	Battery capacity 4000 mAh	Battery capacity 5000 mAh	Battery capacity 3750 mAh
Hall Effect Support	Hall Effect Support	Hall Effect Support	Hall Effect Support
QMK Support	QMK Support	QMK Support	QMK Support
VIA Support	VIA Support	VIA Support	VIA Support
VIAL Support	VIAL Support	VIAL Support	VIAL Support
N-Key Rollover	N-Key Rollover	N-Key Rollover	N-Key Rollover
Rapid Trigger	Rapid Trigger	Rapid Trigger	Rapid Trigger
Mount Style	Mount Style Plate Mount	Mount Style Gasket Mount	Mount Style Top Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb, White, South-face, White South-face	Backlight Rgb, South-face	Backlight Rgb
Case Colors	Case Colors	Case Colors	Case Colors
Case Material	Case Material ABS	Case Material ABS, Plastic	Case Material -
Keycaps Material	Keycaps Material PBT	Keycaps Material PBT	Keycaps Material ABS
Dimensions	Dimensions 31 x 391 x 140 mm	Dimensions 45 x 433 x 142 mm	Dimensions 42 x 409 x 140 mm
Weight	Weight 1241g	Weight 1300g	Weight 1879g

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Product Description

The Keychron K4 Ultra is a wireless mechanical keyboard with a compact 96% layout, suited for users who want a space-saving design without losing most keys. It fits well for those needing versatile connectivity and extensive customization, such as programmers, writers, or hobbyists who remap keys and create macros. It supports multiple operating systems, making it flexible across different setups.

Key Features

Supports 2.4 GHz wireless, Bluetooth, and wired connections, allowing seamless switching between devices and use cases.
Customizable key mapping and macro creation through a web app, enabling personalized workflows and shortcuts.
Powered by ZMK firmware, which provides an 8K polling rate in wireless mode, potentially improving input responsiveness.
Long battery life reported up to 600 hours, reducing the need for frequent charging during wireless use.

Connectivity

The keyboard offers three connection modes: wired for stable, low-latency use; Bluetooth for convenience with mobile devices; and 2.4 GHz wireless for a balance of responsiveness and cable-free setup. This flexibility suits users who switch between multiple devices or prefer different connection types depending on context.

Compatibility and Customization

Fully compatible with Windows, macOS, and Linux, the K4 Ultra supports diverse operating systems without additional drivers. The Keychron Launcher web app allows users to remap keys and program macros, which benefits those who require tailored layouts or complex commands. The use of ZMK firmware also suggests ongoing firmware support and customization potential.

Trade-offs

The compact 96% layout saves desk space but may require adjustment for users accustomed to full-size keyboards with dedicated function rows and navigation clusters.
Details on build materials and typing feel are not specified, so users seeking specific tactile or acoustic characteristics should consider this unknown.
While battery life is long, actual duration may vary based on usage and wireless mode.

Frequently Asked Questions (FAQ)