The input has a MICRO-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 DIYCharging cut-off voltage: 4.2V ± 1%; maximum charging current: 1000mAInput voltage: 5V; battery over-discharge protection voltage: 2.5V; battery over-current protection current: 3A; connect the battery to B+B, plug in the USB female phone charger, the red light is charging, the green light is completely doneWhen charging, the positive and negative terminals of the load terminal should be disconnected. Yes, please follow the specifications, otherwise it will be directly damaged.color:BlueMaterial:plasticPackage Contents:10 x Lithium Battery Charging BoardOnly the above package content, other products are not included.Note: Light shooting 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.