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.