Never need an AC power supply or recharging with the PS-5700, which uses 6 "C" batteries and provides up to 80,000 measurements. Very similar to the best selling PS-6600, it has a black LCD display instead of LED. It also features "push button" calibration, a smaller 13" X 13" "super tuff" cast aluminum platform, accuracy of +/- .1 lb., 500 lb. capacity, with a 3 year manufacturers warrantly. MADE IN THE USA!