The Keychron K4 100-Key RGB Wireless Modular Mechanical Keyboard is a wireless or wired mechanical keyboard with Mac and Windows compatibility, and convenient access to all the essential function keys, with the largest battery seen in a mechanical keyboard. Thanks to its versatile connection modes it can connect with up to 3 devices via Bluetooth and switch among them easily. With the highly reliable and broad compatibility of the Broadcom Bluetooth 5.1 chipset, the K4 is the best fit for home, office and light gaming use while connecting with your smartphone, laptop and i - Pad. To add to this it also has a wired mode with a high-speed USB Type-C connection. The Keychron K4 is designed to fit your dedicated typing experience. This particular model features Gateron Red (linear and quiet feel) or Brown (gentle and tactile feel) switches, both being ideal for office or gaming - while also being hot-swappable, so you can have a more customized experience. The K4 is highly compatible with all operating systems from Mac to Android to Windows. It is one of the few mechanical keyboard featuring Mac layout media keys, which allows you to use all the same media keys as you would in a conventional mac - OS. It also comes with a 100 keys (96%) layout with included number pad and relocated Del key that offers convenient access to all the essential keys* for Mac and Windows in a small footprint. Engineered with more than 15 types of RGB light and comes with different styles (flashing, breathing, or static etc) which will match up to your mood. The K4 can last up to 240 hours of typing with the backlight off, thanks to its big 4000 m - Ah battery. Please note that Num Lock works with Windows OS only. Features: - Wireless with Bluetooth 5.1 or wired with Type-C - Hot-swappable Switches - 100 Gateron Red or Brown Mechanical Switches - Mac/Windows Layout - 15+ Types of RGB Backlit - 96% Layout - High Compatibility Specifications: - Colour: Black - Layout: ANSI - Number of Keys: 100 keys - Switches: Gateron Red or Brown switches - Number of Multimedia Keys: 12 - Main Body Material: ABS - Keycap Material: ABS - Connection: Bluetooth and Type-C - Bluetooth Version: 5.1 - Bluetooth Working Hours: Up to 72 Hours with RGB on and up to 240 Hours with RGB off. - Backlit: Adjustable 4-level RGB backlit - System Compatibility: Windows/Mac - OS - Battery: 4000m - Ah Rechargeable li-polymer battery - Dimensions: 37.6 x 12.9 x 3.8 cm - Weight: 933g NB: please note that the colour variant options relate to the internal switches and not the outward aesthetic colour. Below is a brief outline of how the different switches impact the keyboards Red: linear and quiet feel, for the office or gaming Brown: gentle and tactile feel, for gaming or the office. Blue: clicky and tactile feel, mostly for typist. Black: linear and non-tactile feel, for gaming or the office. What's in the box 1 x Keychron K4 100-Key RGB Wireless Modular Mechanical Keyboard 1 x USB-A to USB Type-C Cable 1 x Keycap Puller 1 x User Manual