Plug-in charger for 2 or 4 AAA or AA cells. Microprocessor controlled charging guarantees best charging results independent of capacity, charge status and type of cells. Trickle charge avoids discharging of cells after fast charging. 6 hours to charge 2100s from empty. This charger brings micro processor control of charging to a new low price level, it does not however monitor individual cells but chargers the batteries as a 2 or 4 cell pack.