The input has a -USB female connector, which can directly input as a mobile phone charger to charge the lithium battery, and the input voltage wiring board is also reserved, which is very convenient for DIY Charging cut-off voltage: 4.2V ± 1%; maximum charging current: 1000mA Input voltage: 5V; battery over-discharge protection voltage: 2.5V; battery over-current protection current: 3A; the battery to B+B, plug in the USB female phone charger, the red light is charging, the green light is completely done When charging, the positive and negative terminals of the load terminal should be disconnected. Yes, please the specifications, otherwise it will be directly . color:Blue Material:plastic Package Contents: 10 x Lithium Battery Charging Board Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.