Intellivolt electronic ballast, operates on 120v-277v systems, for use with 1 or 2 f48t12, f60t12, f72t12 or f96t12 high output lamps, 10% total harmonic distortion, high power factor, ballast factor .850 – .925, 50/60 hz input frequency, parallel lamp connection, 9.5″l x 1.7″w x 1.18″h, wiring diagram &/or instruction sheet enclosed.