Description
The Keychron B4 Pro Ultra-Slim Wireless Keyboard is a sleek and versatile 96% layout keyboard designed for users who value portability, efficiency, and long-lasting performance. With its ultra-thin profile and lightweight 495 g body, it is ideal for home, office, or travel use without sacrificing a full, productive key layout. The keyboard supports 2.4 GHz wireless, Bluetooth 5.2, and wired Type-C connections, allowing seamless switching between multiple devices such as smartphones, tablets, PCs, and Macs.
Powered by an 800 mAh rechargeable battery, the B4 Pro delivers an impressive up to 300 hours of wireless usage on a single charge and can be used while charging for uninterrupted productivity. The high-speed 2.4 GHz mode features a 1000 Hz polling rate, ensuring responsive and stable performance for everyday work. Designed with Mac users in mind, it offers a native Mac layout while remaining fully compatible with Windows and Linux systems.
Customization is effortless with the Keychron Launcher web app, enabling key remapping, macros, and shortcuts directly from a browser—no software installation required. Additional features like ergonomic tilt, quick emoji shortcuts, a plug-and-play receiver with magnetic storage, and a protective silicone skin make the Keychron B4 Pro a refined, reliable keyboard built for modern, multi-device workflows.
Specification
General
- Model: Keychron B4 Pro
- Layout: 96% (100 keys)
- Body Material: ABS
- Keycap Material: ABS
- ANSI Layout
- Backlight: Non-Backlit
- NKRO: No
Connectivity
- Wireless: 2.4 GHz / Bluetooth 5.2
- Wired: USB Type-C
- Bluetooth Device Name: Keychron B4 Pro
- Compatible Systems: macOS / Windows / Linux
Performance
- Polling Rate:
• 1000 Hz (2.4 GHz & Wired)
• 90 Hz (Bluetooth)
Battery & Power
- Battery: 800 mAh rechargeable Li-Polymer
- Wireless Working Time: Up to 300 hours (varies with use)
- Charging Time: ~2.5 hours
- Operate While Charging: Yes
Physical
- Dimensions: 376.8 × 118.9 mm (14.83 × 4.68″)
- Weight: 495 g (1.09 lbs)
- Height:
• Front: 9.6 mm (0.38″)
• Rear: 14.2 mm (0.56″) - Typing Angle: 2.9°
Features
- Keychron Launcher support (web-based customization)
- Quick emoji shortcut (Fn + Shift)
- Plug-and-play 2.4 GHz receiver with magnetic storage
- Protective silicone key skin included
Operating Environment
- Temperature: −10 °C to 50 °C
In the Box
- Keyboard
- USB Type-C Cable
- Type-A to Type-C Adapter
- Type-A 2.4 GHz Receiver
- Silicone Key Skin
Colors Available
- Space Gray
- Ivory White
Connectivity Options
The Keychron B4 Pro Ultra-Slim Wireless Keyboard offers incredibly versatile connectivity, ensuring seamless use across all your devices. You can switch effortlessly between 2.4 GHz wireless, Bluetooth 5.2, and wired USB-C modes. The 2.4 GHz connection delivers a stable and fast connection with a 1000 Hz polling rate, ideal for work that demands responsiveness and minimal latency. Bluetooth 5.2 allows simple pairing with multiple devices such as laptops, tablets, and phones, supporting easy multi-device workflows and connection toggling. When connected via USB-C, the keyboard functions with the reliability and speed expected of wired peripherals, which is especially useful for tasks where uninterrupted connectivity is critical. This diverse set of connectivity options makes it flexible enough to adapt to professional, casual, or mobile setups without hassle or compatibility concerns.
Long Battery Life and Power Management
One of the most standout aspects of the B4 Pro is its remarkable battery life. Equipped with an 800 mAh rechargeable battery, this keyboard can deliver up to 300 hours of wireless use on a single charge — a level of endurance that easily supports weeks of consistent use without the need for frequent recharging. Charging completes in approximately 2.5 hours, and you can even continue using the keyboard while charging, eliminating any downtime during heavy use. This extended battery performance not only enhances convenience but also makes the B4 Pro perfect for travel, remote work, or long sessions that would quickly drain lesser keyboards.
Keychron Launcher and Customization
Customization on the Keychron B4 Pro is made simple and powerful with the Keychron Launcher, a web-based configuration platform compatible with all major operating systems and browsers. Without installing any software, users can remap keys, create custom macros, and assign shortcuts to streamline workflows. This level of personalization allows users to adjust the keyboard to their unique needs — whether setting up complex key functions for software development, creative work, or productivity shortcuts for everyday tasks. Because the launcher runs through a browser, you can access and update your settings from virtually anywhere without being tied to a specific device.
Ergonomic Design and Build Quality
Designed with both comfort and aesthetics in mind, the B4 Pro features an ultra-slim profile that is just 9.6 mm at the front and 14.2 mm at the rear, providing a gentle typing angle of 2.9°. This ergonomic tilt supports a natural hand position that can reduce wrist strain during long typing sessions. The lightweight ABS body and low-profile design give it an elegant, minimalist look while maintaining structural durability. Typing feels stable and consistent thanks to the carefully calculated tilt and robust key placement, making it suitable for extended use in professional settings or everyday typing tasks.
Quick Access Features
The keyboard includes thoughtful features designed to improve usability — such as a dedicated quick emoji shortcut (Fn + Shift) that brings up the emoji panel instantly while typing. This makes personal messaging and creative expression faster and more intuitive without interrupting your workflow. Additionally, the plug-and-play 2.4 GHz receiver ensures a fast setup with no drivers or installations required. The receiver can be stored neatly in the magnetic slot at the top left of the keyboard when not in use, helping keep your workspace tidy and preventing loss during travel.
Protective Silicone Skin
To increase longevity and keep your keyboard looking and performing its best, the B4 Pro includes a protective silicone key skin. Each key is individually molded for a seamless fit that guards against spills, dust, debris, and everyday wear. The silicone skin is also washable and reusable, making it a practical accessory for those who prioritize hygiene and durability. This added protection helps maintain consistent key feedback and extends the usable life of the keyboard — especially useful in environments prone to dirt or accidental spills.
Wide Compatibility and Versatile Use
The Keychron B4 Pro is built for universal compatibility, supporting macOS, Windows, and Linux systems with equal efficiency. It offers a Mac-focused layout with full multimedia and function key support, while still allowing smooth operation on Windows keyboards via remapping with the Keychron Launcher — meaning no need to swap keycaps when switching between platforms. This flexibility, combined with the robust connectivity and customization features, positions the B4 Pro as an ideal keyboard for professionals, students, creatives, and anyone who uses multiple devices in varied environments.
