Keyboard Specfication: Mechanical Switch:Blue Switch Key Layout: 87 Key Battery Capacity: 3300mAh Interface Type: Type-C Connection Method: Wired by USB cable; Wireless by 2.4Ghz Nano USB receiver or Bluetooth 3.0/4.0/5.0 USB Cable Length: 1.6m Compatible System: Windows 2000/XP/Mac OS/vISTA/wINDOWS7/8/10, or any device which support Bluetooth 3.0/4.0/5.0 The way to use it in different connection: Press FN+1/2/3 to start Bluetooth Connection: Power on the keyboard, long press FN+1, the indicator light will be green and flashes quickly, and will stay green light if the device is connected successfully; if long press FN+2, the indicator light will be yellow; if long press FN+3, the indicator light will be cyan. Press FN+4 to start 2.4 Ghz Wireless Connection: Power on the keyboard, place the keyboard near the USB receiver, long press FN+4, the indicator light will be red and flashes quickly, then plug the USB receiver into your computer USB port, the indicator light will stay red if the keyboard is connected successfully. Press FN+5 to start wired connection: Power on the keyboard, use the type-C USB cable to connect it with your computer, long press FN+5, the indicator light will be white and flashes quickly, and will stay white light if the keyboard is connected successfully. Different ways to adjust the Backlight: Multi-media Key Combinations Function: Kind tips: 1. Before the initial use of wireless product, using the attached USB cable to fully charge the keyboard is recommended, pls remember to plug the USB cable correctly to your computer USB port or use DC-5V charger to charge it. 2. The keyboard will auto turn off the backlight if no use in 2-3minutes in wireless mode, press any key can wake it up. 3. When using it in wireless mode, if the backlight become dim or the keyboard cannot work properly, the keyboard will be low battery.Can be compatible with any PC, Mac, Laptop, Computer which support Windows 2000/XP/Mac OS/Vista/Windows 7/8/10, or any devices like smart phone, ipad, etc. which support Bluetooth 3.0/4.0/5.0. Designed with ergonomic 87 key layout, mini size, lightweight, ,rechargeable large capacity 3300mAh battery. This rechargeable mechanical gaming keyboard is equipped with mechanical Blue switch, support conflict-free full key, can create a clicky sound with comfortable tactile feel when using, increase the typing responsiveness. Made of high quality wear-resistance PBT material, luminous keycap, thicken aluminum plate. 3 Mode Connection,This compact mechanical gaming keyboard adopt wired, 2.4Ghz wireless transmission, Bluetooth technology, Connects with up to 3 devices via Bluetooth and switch among them easily.