18650 /17670 3.6V/3.7V Rechargeable Li-ion Battery The Voltage of full charge and cut-off Charge is 4.2V and 2.75V Input:AC100V-240V 50/60Hz Max150mA; Output:DC4.2V=800mAh *For digital camcorder/video battery charger series *For digital camera battery Charger series This is Upgraded Smart charger, just install 2 18650 batteries in the dual slot, plug in the elec. outlet, the indicator turns RED, when RED light turns GREEN, the batteries are ready.