Advance Magnetic Fluorescent Ballast, Series: SignPRO, T12HO Lamp, 110 W Lamp, 136/133 W Wattage, 120 to 277 V AC, 1.14 A, 50/60 Hz Frequency, Instant Start, Total Harmonic Distortion: 10%, Power Factor: 0.98, 4 Lamps, Ballast Factor: 0.68, ANSI C82.1 Ballast Grade, Metal, 9.64 in L x 1.69 in W x 1.13 in H Dimensions