Input voltage: 5V; Battery over-discharge protection voltage: 2.5V; Batteryovercurrent protection current: 3A; Connect the battery to the B + B-, inserted into the USB female mobilephone charger, the red light is being charged, the green light to full. Charging indicator: Charging - Red light;Fully charged - Blue light The charge should disconnect the load OUT terminal on the positive and negative can not be wrong, please according to specifications, otherwise it will damage directly. Adjustable charging Current: With liner charging way, the charging current is adjustable, maximum to 1A On-board -USB and soldering joints 5V input`port and charging status indicator(red indicator is charging,green indicator is full charged) colour:Blue Material:plastic Package Contents: 6 x for TP4056 Charging Module Only the above package content, other products are not included. Note: Light 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.