Includes PFO Electronic VHO ballast enclosed in metal ballast box with TWO on/off switch. Quick Disconnect. Wired plugs and VHO rated end caps/mounts. Can handle four 48" bulbs. Units are key hold flanged for easy cabinet mounting. Note picture above is not actual product, ballast box is approx. twice the length as picture DIM: 21"L x 5"W x 3"H bulb not included