This is a two pad system with each pad having 250 watts of power, total output of system is 500 watts. This makes for easier installations in tight places requiring the model 1325 where there is not enough space to apply one large heater. Many times these are put on each side of the oil pan. 500 watts, 4.16 amps, 120 volt each pad 3.5 X 5.25 X .08" tethered together with 15" cord with one plug on a 6'cord.