Rechargeable Tri-mode Wireless Gaming Mechanical Keyboard – 3 Mode Connection ( BT 3 Devices / 2.4G Wireless / Wired ) TKL Keyboard -Hot Swap Blue Switches – Single Blue LED Backligh – Built in battery 2500mAh – Removable Type-C cable – PBT Keycap 87 EN Keys layout | Black Connection method 1- Bluetooth connection : Push the switch to the “BT/2.4G” position, press FN+Q/W/E to enter Bluetooth 1/2/3 mode, press and hold FN+Q/W/E for more than 3 seconds to enter the pairing mode, the indicator light flashes quickly, and the device [K80 BT3.0/5.0] is searched. Click pairing, the indicator light for the connected device is always on, if not connected to the device, the indicator light is red, and the keyboard goes to sleep. After BT3.0 is connected, it displays: K80BT3.0 KB After BT5.0 is connected, it will display: K80 BT5.0 KB Note: Windows 7 and below systems do not support BT Bluetooth mode 2- Wireless 2.4G connection : Push the switch to the “BT/2.4G” position, insert the USB receiver, press FN+R to switch to 2.4G mode, press FN+R for more than 3 seconds to enter the pairing mode, the indicator light flashes quickly, exit the pairing mode after the pairing is successful, the mode light is always on for 25 seconds, after 30 seconds when the paired device cannot be found, the pairing mode light goes out and the keyboard goes to sleep. After wired connection, it displays: K80 After 2.4G connection, it will show: Wireless Receiver 3- Wired connection : Push the switch to the “cable” position, plug in the Type-c data cable, the T key indicator light flashes three times, and switches to wired mode. Lighting effect setting function FN+PRTSC switches 24 backlight modes grid, starlight flower FN+scik keyboard light Switch Off FN+ — Lighting speed slows down Lighting effect speed accelerationFN+↑ —Backlight brightness +FN+↓——Backlight brightness – || ( Content BY NEXTmart)