Features: 

With 5V USB output, can be used as a mobile power ( put into the lithium battery, and start the USB output ).LCD displays charge situation, battery voltage, charging current and charged battery capacity.Charge and discharge automatically.Use the constant current and voltage charging mode.Use DV control technology, with higher charging efficiency.Compatible with any combination of 1.2V and 3.7V cylindrical batteries ( rechargeable battery which diameter is less than 26mm and height is 34 - 70mm ).Suitable for 12V car adapter ( car charger is not included ). You can select 0.50A 0r 1.00A charging current for batteries with different capacity.Under the capacity grading mode, discharge current could be 0.25A or 0.50A ( for batteries with different capacity ).With battery reverse polarity protection and short-circuit protection ( not show battery icon, current or voltage ).Automatic activation function:  Automatically activate zero voltage lithium batteries ( batteries with instantaneous short circuit protection ).For battery that voltage is greater than or equal to 0.5V, or the voltage and capacity of battery would not be displayed on the LCD, but shows NULL.With a buzzer, and there will be a beep after accomplishment of every charging and discharging with any slot.