Efest LUC V4 Battery Charger with Included Car Charge Cable Fast Charging: Three charging mode options 0.5A/1A/2A. Automatically detect battery status and selects the appropriate charging Mode. HD LCD SCREEN: Display precise voltage and battery charging current. Input: AC 12/24V Output:4.2-4X0.5V,4.2-4X1A,4.2-AX2A. USB output:DC 5V 1A. USB output: as a power bank, for charging cell phone,iPad, MP4, etc. Capable of charging 4 batteries simultaneously, each slot displays charging status independently. Protection:4 kinds of protection as over-discharging, over-voltage,short-circuit and reverse polarity protection. Auto-stop when fully charged & auto-recharge when voltage lower than 4.10V. Activation function: LUC V4 can active the low voltage batteries equal or higher than 0.6V.