What makes the Keychron B4 Pro UltraSlim stand out among compact keyboards?

The Keychron B4 Pro UltraSlim is designed with portability and versatility in mind. Its ultra-slim profile makes it exceptionally easy to slip into a bag or backpack, while still providing a comfortable typing experience. Additionally, it supports multiple connection modes, allowing you to switch seamlessly between devices.

Can I use this keyboard with my tablet and laptop at the same time?

Yes, you can! The B4 Pro UltraSlim supports both Bluetooth and 2.4 GHz wireless connections, as well as a wired USB option. This flexibility allows you to pair the keyboard with multiple devices and easily switch between them, making it ideal for multitaskers.

Does the Keychron B4 Pro UltraSlim work with both Mac and Windows systems?

Absolutely. The keyboard is designed to be highly compatible with a range of operating systems, including macOS, Windows, and even Linux. It includes keycap legends and shortcuts tailored for both Mac and Windows users.

How long does the battery last on a single charge?

The B4 Pro UltraSlim is engineered for extended use, with a battery that can last for days on a single charge, depending on your usage habits and connection type. When the battery runs low, you can continue using the keyboard in wired mode while it charges.

Is the typing experience comfortable on such a slim keyboard?

Despite its ultra-slim design, the B4 Pro UltraSlim offers a satisfying typing experience. It features low-profile switches that provide tactile feedback and comfortable key travel, making it suitable for both long writing sessions and casual use.

What types of wireless connections are supported?

You can connect the B4 Pro UltraSlim via Bluetooth for a cable-free setup, or use the included 2.4 GHz wireless dongle for a more stable and responsive connection. Both options ensure smooth performance across different devices.

Can I customize the key functions or layout?

The B4 Pro UltraSlim supports basic key remapping and multimedia shortcuts, giving you control over your workflow. While it doesn’t offer advanced programmability, its intuitive design helps streamline everyday tasks.

Is the keyboard suitable for travel?

Definitely! The ultra-slim form factor and lightweight build make the B4 Pro UltraSlim a perfect travel companion. It easily fits into most laptop sleeves or backpacks, and the durable construction ensures it can handle life on the go.

How do I switch between connection modes?

Switching between Bluetooth, 2.4 GHz, and wired modes is quick and simple. The keyboard features dedicated controls or key combinations that allow you to toggle between connection types without hassle.

Are the keycaps removable for cleaning or customization?

Yes, the keycaps on the B4 Pro UltraSlim can be gently removed for cleaning or swapping with compatible low-profile keycaps, allowing you to personalize your typing experience.

Keychron B4 Pro Starting at $38.99

Name: Keychron B4 Pro
Brand: Keychron

Vendor	Location	Coupon Code	Price (USD)	Link*
Keychron B4 Pro Ultra-Slim 96% Wireless ...
	Based in US	-	$40	Visit Shop
Keychron B4 Pro Ultra-Slim Wireless Keyboard
	Shipping to US	-	$39	Visit Shop
Keychron B4 Pro Ultra-Slim Wireless Keyboard(US ANSI layout)
	No shipping to US		$58	Visit Shop

Vendor

Location

Coupon Code

In Stock

Price (USD)

Link*

Keychron B4 Pro Ultra-Slim 96% Wireless ...

Based in US

$40

Visit Shop

Keychron B4 Pro Ultra-Slim Wireless Keyboard

Shipping to US

$39

Visit Shop

Keychron B4 Pro Ultra-Slim Wireless Keyboard(US ANSI layout)

No shipping to US

$58

Visit Shop

Compare Keychron B4 Pro vs Keychron B6 Pro vs Keychron B33 Specification

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

Model	Keychron B4 Pro	Keychron B6 Pro	Keychron B33
			66
Rating	0.0 stars (0 reviews)	4.8 stars (24 reviews)	4.7 stars (3 reviews)
Purchase Options
Main differences	Available in a 96% layout Equipped with a 800 mAh battery Weighs about 495 g Sized at -1 x -1 x -1 mm Made with a ABS case	Released in 2024 Available in a 100% layout Built with the ISO, JIS, ANSI layout standard Uses a Plate Mount mounting style Equipped with a 1200 mAh battery Weighs about 623 g Sized at 5 x 429 x 130 mm Made with a Plastic, ABS case Offers Yes, North-face RGB lighting	Available in a 80% layout Features N-key rollover Includes screw-in stabilizers Has built-in sound dampening Uses a Gasket Mount mounting style Equipped with a 4000 mAh battery Weighs about 1977 g Sized at 33 x 370 x 146 mm Made with a Metal, ABS case Features PBT, ABS keycaps
Score	Scores Performance: 49.1 Build Quality: 43.2 Productivity: 67.7 Customizability: 42.2 Portability: 51.6	Scores Performance: 52 Build Quality: 45.3 Productivity: 65.8 Customizability: 51.8 Portability: 50.9	Scores Performance: 56.4 Build Quality: 65.7 Productivity: 85.3 Customizability: 51.9 Portability: 73.6
Name	Name Keychron B4 Pro	Name Keychron B6 Pro	Name Keychron B33
Release year	Release year 2025	Release year 2024	Release year 2025
Switch Options	Switch Options Linear, Tactile, Clicky	Switch Options Linear, Tactile, Clicky	Switch Options Linear, Tactile, Clicky
Profile	Profile Low Profile	Profile Low Profile	Profile Low Profile
Hot Swappable	Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size 96%	Layout Size 100%	Layout Size 80%
Layout Standard	Layout Standard ANSI	Layout Standard ISO, JIS, 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	Display Support
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 1000 Hz	Polling Rate 1000 Hz	Polling Rate 1000 Hz
Battery capacity	Battery capacity 800 mAh	Battery capacity 1200 mAh	Battery capacity 4000 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 -	Mount Style Plate Mount	Mount Style Gasket Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight	Backlight North-face	Backlight
Case Colors	Case Colors	Case Colors	Case Colors
Case Material	Case Material ABS	Case Material Plastic, ABS	Case Material Metal, ABS
Keycaps Material	Keycaps Material ABS	Keycaps Material ABS	Keycaps Material PBT, ABS
Dimensions	Dimensions -1 x -1 x -1 mm	Dimensions 5 x 429 x 130 mm	Dimensions 33 x 370 x 146 mm
Weight	Weight 495g	Weight 623g	Weight 1977g

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Product Description

The Keychron B4 Pro UltraSlim is a compact 96% wireless keyboard designed for users who want a slim profile with versatile connectivity. It suits office workers and casual users who value a clean desk setup and the flexibility to switch between multiple devices. The keyboard supports both wireless and wired connections, making it adaptable for different environments.

Key Features

Wireless options include Bluetooth 5.2 and 2.4 GHz, allowing connection to multiple devices with stable performance.
Wired mode provides a direct connection for situations requiring minimal latency or charging while typing.
The 96% layout offers most keys in a compact form, saving desk space while retaining dedicated function and navigation keys.
Ultra-slim design reduces keyboard height, which may improve ergonomics for some users but could feel less cushioned during long typing sessions.

Connectivity

The keyboard supports three connection modes: Bluetooth 5.2 for modern wireless devices, 2.4 GHz wireless for potentially lower latency and less interference, and a USB wired option. This variety allows seamless switching between devices or use in environments where wireless signals are restricted.

Trade-offs

The ultra-slim case may reduce typing comfort for users who prefer a more pronounced key travel or cushioned feel.
Unknown details on build materials and typing sound make it harder to assess durability and acoustics.
No information on firmware customization or key remapping limits understanding of personalization options.

Use Cases

Good for office users needing a compact keyboard with flexible connectivity for multiple devices. Less ideal for heavy typists or gamers who prioritize key travel depth or extensive customization. Suitable for those who prefer a minimalist desk setup and wireless convenience.

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