Features: World wide voltage input. Constant voltage and current for charging. Not charge when the battery positive and negative is reverse. Charging for flat cylinder lithium batteries 18650/16340. Repairing the low-voltage battery. Trickle charging function to ensure that the battery is in saturated. Specifications: Input: 100-240V 47-63Hz. Output: 3.7V/500mA. Color:Black Size:10.8 x 4 x 4cm Net weight:64g Package Content: 1 x Universal Battery Charger