Description: Lithium battery charging board. (Linear charging) Charge Current: 1A (adjustable) ; Charging accuracy: 1.5% Input voltage: 4.5-5.5V; Full charge voltage: 4.2V Charge Indication: Red light is charging, Green light is full charge Input interface: Micro USB Working temperature: - 10 ? to + 85 ? Size: approx. 25 x 19 x 10mm Can not reverse Package Includes: 10 Pieces 1A Lithium Battery Charging Board Note: Color maybe slightly different due to different monitor. The above size is measured by hand, please allow slightly difference. Thanks !