Advance SmartMate Compact Fluorescent Ballast, Electronic, CFL Lamp, 13 W Lamp, 29 W Wattage, 120 to 277 VAC, 0.11 to 0.25 A, 50/60 Hz Frequency, Programmed Start, 75 deg C Minimum Starting, Total Harmonic Distortion: 10 %, Power Factor: 0.98, 2 Lamps, Ballast Factor: 1, Metal/Plastic, 4.98 in L x 2.4 in W x 0.98 in D Dimensions