Intelliv electronic ballast, for 1 or 2 f17t8, f25t8 or f32t8 lamps, operates on 120v or 277v systems, high power factor, ballast factor .850 - .925, 50/60 input frequency, parallel lamp connection, 9.5"l x 1.3"w x 1.0"h, wiring diagram &/or instruction sheet enclosed, energy saving.