Feature:Micro USB femal socket, can be connect with mobile phone charger directly ,for charging lithium battery.LED indicates status.(power/charge/battery).Specifications:Input: Micro USB female or + and - solder terminals.Input voltage:  5V.Charge cut-off voltage: 4.2V + / - 1%.Maximum charging current output: 1000mA.Battery discharge protection voltage: 2.5V.Battery over-current protection current: 3A.Size: 2.7cm x 1.7cm.---1.06inch x 0.067inch.Red led on - charging.Green led on - charge complete.Package Included:1 x Micro USB 18650 Lithium Battery Charging ModuleNO Retail Box. Packed Safely in Bubble Bag.