1.2.4G Wireless 2 Players Encoder PCB Board General use: designed for PC/computer games, multiplayer games, Android smart devices, set boxes game consoles, and similar applications. Power requirements: the motherboard usually uses two 5V/7V batteries with 3V power. it is not recommended to use a 3.7V lithium battery, as longterm use may burn out the main control chip. if you want to use a rechargeable motherboard, you need to a rechargeable one. Indicator lights and battery status: both boards are the same. the one that powers on first has the P1 indicator light always green, and the second PCB motherboard has the P2 indicator light always red. when the battery is low, the indicator light will alarm, and the battery needs to be replaced. Sleep and wake behavior: if the motherboard is powered on but not connected to the receiver, the red and green lights flash slowly. after flashing for several tens of seconds, it enters sleep mode. use the MODE/ button to wake up the motherboard.