This is a miniature battery charger based on the TP4056 integrated circuit. It is ideal for adding an embedded battery charger to your new project. Charge Li-Ion batteries from on board Micro USB connector from USB or external +5V source. With Micro-USB on board connector, you can directly connect to computer USB port for battery charging. If USB is not available you can use a external source voltage at IN+/IN- pads Great for DIY projects Chipset: TP4056 Input voltage: 4.5V~5.5V Fully charged voltage: 4.2V Working temperature: -10'C~85'C Charging method: Linear charging 1% Charging precision: 1.5% Charging indicator: Red light charging, Green light fully charged Interface: Micro USB Maximum charging current: 1000mA Micro USB female outlet for input end, can be used to charge the lithium battery by 5v charger directly. Connect €œB+€to positive electrode of battery and €œB-€ to the anode. Connect €œOut+€and €œOut-€ to load. Brand: Arduino Type: Charge Controller.