Features: Be suitable for 3.7V Li-ion 1.2V Ni-MH cylindrical rechargeable battery of size between: (diameter: 0-22mm, height: 34-70mm). Capable of charging 4 batteries of different size and with different capacity simultaneously. Each of the four battery slots monitors and charges independently. 4 optional charging current: 300mA / 500mA / 700mA / 1000mA. USB output can charge your 5V electronic devices (such as phones) when putting the Li-ion batteries in the slots. Charger, fast test and normal test modes, test modes test the maximum capacity of the batteries. LCD displays charging current, voltage, capacity, impedance and charging time. Features over current protection, over charge protection, short circuit protection, and battery polarity reverse connection protection. Automatically stops charging when complete. You can choose different matches, like only buy the charger, or you can buy the whole set (Charger+ car charger + EU/US adapter) or buy the Charger+ US/EU adapter as you like. Safe, portable and powerful, it is good for your home and travel.