[Gasket Mounted Keyboards] - Elevate your typing experience with RK H81, which utilizes a high-quality gasket material to absorb vibrations and eliminate any unwanted noise. The gasket material creates a buffer between the keyboard plate and the case, providing exceptional stability and more precise keystrokes. Ideal for professionals who demand precision and comfort, gamers who need speed and accuracy. [Multi-device Connection] This tkl keyboard has three connection modes: USB-C wired, 2.4G wireless, and Bluetooth 5.1. It's suitable for those who need versatility and convenience in their daily routine. You can connect up to 5 devices and easily switch between them with the knob of the wireless mechanical keyboard. The gaming keyboard wireless' system requirements: Windows 7 or later, Mac OS X 10.10 or later, Chrome OS, Android 3.2 or later, USB port [RK Pale Green Switch] Equipped with a fully customized pale green switch featuring POM material casing. Boasting tactile force of 40gf and total travel distance of 3.4mm, with trigger stroke of 2mm, offers lifespan of up to 50 million keystrokes. The keypresses of keyboard gaming offer a light and smooth feel, delivering a linear response and quick rebound. The pre-factory lube guarantees a steady and noiseless experience, providing a clean and accurate tactile feedback. [3750m - Ah High-capacity Battery] - This wireless keyboard delivers up to 7 days of using on 3750m - AH battery. And it has double-layer inclined bottom frame ensures comfortable typing even without a wrist rest. with its hot-swap PCB, you can easily replace 3 pins/5 pins switches. [RGB Backlit] With selection of 18 RGB Backlight Modes, 8 monochrome Backlight Modes, 1 full Color Backlight, 3 custom RGB Backlights, and a staggering 16 million colors to choose from on each individually backlit key. With Windows software, this RGB keyboard's lighting and macro key settings can be adjusted according to your creativity Introduction:RK81 is a RGB backlight gasket-mounted hotswap mechanical keyboard with 81 keys. - It supports Wireless/Wired Dual Mode Connections to the device and Compatible with Windows Mac - OS Android system. - It has various application designs,such as All Keys Without Conflict,brilliant color Backlit and control of hardware Backlit Specifications:Size:13.2x5.5x1.5 inches (33.6x14.2x4 cm) Layout: 81 Keys Backlight: RGB Material: ABS Switch: Pale Green Keyboard Colors:Deep Blue Modes:Bluetooth 5.1 / Type-C USB / 2.4Ghz Voltage:5V Systems Support:Windows XP/VISTA/7/8/10,IOS,Macos,Linux,Android Connect Bluetooth 1. Turn the knob to B1; 2. Select a group of BT modes to be connected through FN+Q/W/E; 3. Press FN+Q for a long time. - At this time,the Q key will flash FAST,and the keyboard has entered the pairing mode 4. Open the computer/mobile BT,search and connect the device 5. Connect successfully,Q key stops flashing 6. Turn the knob to B2, press FN+W when you connect the 2nd bluetooth device; style="color: rgb(51, 51, 51); font-size: 16px Turn the knob to B3, press FN+E when you connect the 3rd bluetooth device Package Content: 1x - Type-C cable 1x - Keycap Puller 1x - User Manual