ITEM NAME:Micro USB 1A Lithium Li-ion Protection 18650Battery Charging Board3.7/3.6/4SEAU Specifications: Input voltage: 4.2V Charging current: Max. 1A Over-discharge Protection voltage:2.5V Overcurrent Protection Current: 3A Size: 2.6*1.7cm Package Includes: 1 x Battery Protection Board.Charging current: Max. Overcurrent Protection Current: 3A. 1 x Battery Protection Board. Size: 2.6 1.7cm.