For aa and aaa nimhnicd rechargeable batteries intelligent microprocessor with lcd display indicators for charging fully charged defective and wrong battery type plugs into any standard uk wall socket automatic short circuit and reverse polarity protection over charge protection charges 1 to 4 individual batteries batteries not included charging rates aa 12v dc 1800ma x1 pcs 900ma x2 pcs 450ma x3 pcs 450ma x4 pcs aaa 12v dc 900ma x1 pcs 250ma x2 pcs 225ma x3 pcs 225ma x4 pcs