This is a Mole Richardson Electronic Ballast. It is a multi-voltage AC squarewave ballast for the Mole Richardson 200 watt DigiMole HMI Par Light fixture. Constructed of solid and sheet aluminum, it has an anodized finish. Its On/Off rocker switch allows hot-restrike of the HMI bulb in the fixture. It includes a 5' power cable and 5 Amp fuse.