1) Three output connectors, can charge the rechargeable batteries at home, outdoors and in the car 2) Suitable for 1-4 AA/AAA 1,2V Ni-MH or Ni-Cd rechargeable batteries 3) Four individual charging channels 4) AA/AAA batteries self identification 5) Support mixed charging 6) Microprocessor-control System (Protect and safety) a) Over current protect b) Over time stop c) Over hot stop d) Delta V and 0 Delta V stop e) Over voltage stop f) Automatically change to trickle charging after battery is full 7) Auto stop (non-charging) for Alkaline and bad batteries 8) Charging by power adapter (100-240V, 50/60Hz) or car adapter (12V, 1A) 9) LED signal for the charging status