Micro USB 5V 1A 18650 TP4056 Li-ion Charger Module Dual ProtectionMicro USB input terminal with a female, can be directly input to do with the phone charger rechargeable lithium battery, And still retains the input voltage wiring pads, can be very convenient DIY.It can be used for voltage 3.6 3.7V, etc. 18650, polymer and other lithium battery charge and discharge protection.Input voltage: 5VCharging cut-off voltage: 4.2V ± 1%Maximum charge current: 1000mABattery over-discharge protection voltage: 2.5VBattery overcurrent protection current: 3ABoard size : 17.16 mm x 26.17 mm