A hi-tech battery charger with auto-detect systems for charging either Nickel Metal Hydride or Nickel Cadmium batteries. This powerful Universal Charger accepts AAA, AA, C, D and 9V Block batteries and automatically switches from fast charge to trickle charge when full charge is reached, with LED indication of status. Use your batteries more than 1.000 times. Save up lots of money, time, and trouble and have them there when you need them. With test, charge,discharge, switch.