Charger Features:Support Battery Type:Li-ionSupport Battery Size : Up to diameter 19mm , up to length 71mmTwo independent charging channels: For AA,AAA,18650,14500,CR123A,16340,17650,17670,18500 Li-ion batteryNot charge when the battery positive and negative is reverse.Reverse-polarity protection circuit board. Specification:* Input: 100-240V, 47-62Hz.* Output: 1.2V/700mA, 4.2V/600mA.* Charger Size : L 2.1cm, H 3.4cm, Diameter: 3.4cm