Ac input voltage 110v-220v charging current:aa/150ma,aaa/80ma 9v/21ma built in automatic safety charge cut off ni-cd battery charger with two way individual charge indication. charge time for battery in different capacity. temperature safety control function. charge for both ni-mh/ni-cdaa,aaa and 9v battery. no load power consumption1.5w max carrying power consumption 3.5w max. it uses rechargeble batteries like those of, wireless door bell,remotes, digital camera,cordless phones,clocks,flashlights,spinning tooth brushes,remote control cars,coffee bean grinders, travel alarm clock, walktalkies smoke alarms