Kastar Dual USB rapid charger, the supper slim Micro USB camera battery charger. | New design, easy to carry. Input: 5V 2A; Output: 4.2V/8.4V 600mA*2. | Can be powered by USB Wall & Auto Charger or a Computer, LED indicate: Red light for charging; Green light for standby or full-charge. | With the newest generation of CPU control, automatic constant current control prevents battery from overcharging and short circuit. | Compatible: Nikon EN-EL20 EN-EL20A and Nikon Coolpix A, Nikon 1 AW1, Nikon 1 J1, Nikon 1 J2, Nikon 1 J3, Nikon 1 S1, Nikon 1 V3, Nikon DL24-500, Blackmagic Pocket Cinema Camera