Wiring Operating Sequence:B- Terminal Wiring: The blue silicone wire at the B- terminal of the protection board is connected to the total negative pole of the battery pack (This must be connected first and welded firmly. If the B- terminal is loosely connected or disconnected during the use of the connected load, the protection board be irreparably damaged). Connect the battery balancing lines; According to the actual series number of the battery, wire according to the corresponding series number wiring diagram. After connection, insert the socket with the black balancing line first and then the socket with the red balancing line. Protection Board Communication Port: The two black wires on the far right of the communication port are the startup wires. The other empty interfaces are used for custom communication or connection to the display screen. After the protection board is initially wired, it needs to be activated and started up to search for the Bluetooth signal. During activation, the buzzer of the protection board emit a 'beep', the left red working light starts to flash, and the right blue Bluetooth light also flashes. There are several startup methods for the protection board: As shown in the figure, the startup wire of the communication port is connected to a switch (regardless of positive and negative poles). Short- the switch to activate and start up. The function of the switch:First: When the protection board is off, short-pressing the switch can activate and start up; when the protection board is in standby, short-pressing can wake up and release the standby. Second: In the parameter settingmanufacturer parametersfunction configuration 1, check the [Long to shut down1 function, and you can achieve shutting down by long-pressing the switch for 10 seconds and releasing it. It depends on personal needs whether to reserve the switch button Colour: AS Shown Material: PC+Aluminum Alloy Specification:120A Package Contents: 1 x Battery Protection board(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.