Features: Brand new and high quality YK75 adopts three connection modes of 2.4G, Bluetooth-compatible 5.0,and Type C, The 2.4G receiving range is 8 meters, Bluetooth-compatible receiving range is 5M, built-in 1850mA 3.7V lithium battery is rechargeable. USB Full Speed 2.0 supports up to 1000HZ true report rate. Support N-key rollover(which is all keys are pressed at the same time and are recognized). All lighting effects support global control: brightness increase and decrease (5 levels in total, 3rd level by default), speed (5 levels in total, 3rd level by default), and the overall backlight flashes when it is adjusted to the limit. (1)Mode switching:Switch between wired and wireless mode (Including 2.4G/Bluetoothmode) through the switch in thedevice's upper right corner. After switching to wireless mode, the mode indicator light in the upper right corner: BT1 blue light/BT2 green light/BT3 yellow light/2.4G white light. (2) Bluetooth-compatible mode connection:FN+1! Short press: switch devices (blue light flashes three times) Long press for 3 seconds: enter code pairing (blue light flashes quickly) computer/mobile phone searches and connects the device, after the connection is successful, the indicator light stops flashing and stays on, connection succeeded. FN+2@ Short press: switch devices (green light flashes three times) Long press for 3 seconds: enter code pairing (green light flashes quickly) computer/mobile phone searches and connects the device, after the connection is successful, the indicator light stops flashing and stays on, connection succeeded. Specifications: Mode: Bluetooth-compatible 5.0/2.4G wireless /Wired Flash ROM: 64KB Operating voltage: VDD = 3.3V - 5.5V Working environment temperature: - 40C - + 85C Package form: LQFP64 Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1PC x YK75 Mechanical Keyboard