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Product parameters: Product name: L400 Three mode Wireless Keyboard Connection mode: 2.4G+BT1+BT2 Number of keys:81Keys Mcu: HS6621DQ Return rate: 133Hz Charging current: maximum 560mA Voltage/current: 3.7V/50mA Button life:50 million times or more Keycap material:ABS Charging interface: USB to Type-C conversion（1.5M） Luminous Type:Rainbow backlight Keyboard type:Membrane keyboard Number of conflict free keys: 24 keys without conflict Battery capacity: 2000mAh Bluetooth, 2.4G mandatory code matching mode: Esc+Q Supports connecting 2.4G and two Bluetooth devices, with a wireless transmission distance of 10 meters Product size:35.9x14.6x4.3cm Product weight:579g Packaging size:38.5x17x4.5cm Packaging weight:785g   Products include: 1* L400 three mode Wireless Keyboard 1* USB receiver 1* USB to TYPE-C charging cable（1.5M） 1* Instruction manual   System Requirements: Windows 98/Me/2000/XP/Vista/ Win 7/Win8/Win10/Win11 or Mac IOS and Linux latest.     Sleep mode: The backlight remains on during normal use, and automatically turns off after 60 seconds of no one using it, entering an idle state (triggering any key to turn on the backlight). After 10 minutes, it will enter sleep mode and needs to be awakened to use.   How to use: First, turn the power switch to the "ON" position and turn on the power switch BT1 mode wireless connection: After pressing the FN+1 button, connect to the BT1 wireless connection mode. The red indicator light in the upper right corner will flash rapidly, and you can search for the connection name "BT Keyboard". Click to connect to the "BT Keyboard", the indicator light will turn off after connection, the keyboard light will light up normally, and the keyboard can be used normally. BT2 mode wireless connection: After pressing the FN+2 button, connect to the BT2 wireless connection mode. The blue indicator light in the upper right corner flashes rapidly, and the connection name can be searched for as "BT keyboard". Click to connect to the "BT keyboard", the indicator light will turn off, the keyboard light will be on normally, and the keyboard can be used normally. 2.4G mode wireless connection: Press FN+3 to switch to 2.4G wireless connection mode, and the green indicator light in the upper right corner will flash quickly. After inserting the blue USB receiver into the computer, the 2.4G indicator light will turn off and the keyboard light will light up normally. The keyboard can be used normally.