Sun System Harvest Pro 1000 watt switchable ballast operates both HPS or metal halide lamps with the flip of a switch, Its aluminum enclosure dissipates heat keeping the critical components cool with separate compartments for the coil and capacitor. A heavy duty handle for easy carrying or hang it on a wall, rubber feet reduce noise and vibration. The "Power Pointer" allows the ballast to operate on both 120 and 240 volt systems: by unpluging the 120 power cord , turning the Power Pointer arrow down for 240 volt power, and plug in a 240 volt power cord. In great condition. Works awesome!