Specially for charging and discharging Ni-Mh rechargeable battery and for the best function and the longest longevity of the batteries; Can charge or discharge 1~4 pcs AA /AAA rechargeable batteries at the same time or separately; Visual digital display; Can also repair the rechargeable battery test the max. capacity of battery and test internal resistance etc.; Over-temperature protection; The max. charging current of each battery is 1500mA; LED backlight; With 2.8" LCD display screen to show the real-time charging / discharging capacity voltage current time and internal resistance of 4CH batteries