Features: Negative delta V cut-off function Safety time to prevent over charge Short circuit protection Reverse-polarity protection Bad cell detection Estimated Charging times: AAA size: Capacity: 600 - 900 mAh Charging time: 1.5 - 3 hrs. AA size: Capacity: 800 - 2500 mAh Charging time: 1- 3 hrs. C size... Recharges batteries in all capacities: 2-4pcs AAA, AA, C, D and 1-2pcs 9V. NiCd & NiMH batteries can be mixed to charge at the same time. Features: Easy to use Powered by the supplied AC adaptor when using at your home or office or by the supplied 12VDC car adaptor for use in your vehicle