Graphic details Product voltage range: L1 1.5-8.99V L2 9V L3 10V L4 10.6V L5 11.4V Product size: 2.7*62*15.8mm Directions: 1. During the charging or discharging process, press the red button lightly with your finger, the LED light will light up, and the current passing through the light board circuit is about 30mA. 2. Release your finger, the LED light will go out, the light board circuit will be turned off, and no current will flow. 3. The board has a reverse connection function, so it doesn’t matter if the positive and negative wires are connected incorrectly, just adjust them.