Universal Voltage 110V-240V fits anywhere in the world. Charge single or two batteries at a time Compact and portable design. Rectangle shape, with a foldable plug. Quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock. The charger will automatically turn to trickle charge mode after the battery is fully charged to provide output shortage protection. Specially designed for 18650 rechargeable Lithium Battery. Input voltage: AC110V~240V 50/60Hz Max:150mA Output voltage: DC4.2V - 600mA.