Advance Fluorescent Sign Ballast, Series: SignPRO, T12HO Lamp, 110 W Lamp, 390/384 W Wattage, 120 to 277 V AC, 3.4 A, 50/60 Hz Frequency, Instant Start, -20 deg F Minimum Starting, Total Harmonic Distortion: 10%, Power Factor: 0.98, 4 Lamps, Bi-Pin Lamp Base, Ballast Factor: 0.6, Metal, 14.31 in L x 3.19 in W x 2.63 in H Dimensions