Note: The first time you access the battery, there may be no voltage output between OUT+ and OUT-, then access the 5V voltage charge to activate the protection circuit, the battery is shorted from B+B- and then connected to the battery also need to be charged to activate the protection circuit. When using a cell phone charger as input, note that the charger must be able to output 1A or more, otherwise it may not be able to charge the MICRO USB female connector and the + - pad next to it is the power input, access to 5V. B+ connects to the positive terminal of the lithium battery, B- connects to the negative terminal of the lithium battery, OUT+ and OUT- connect to the load, such as connecting to a mobile booster board positive and negative poles or other loads. Connect the battery to B+ B-, insert the cell phone charger into the USB female socket, the red light is on for charging, the green light is on for full.