Advance SmartMate Compact Fluorescent Ballast, Electronic High Frequency, CFL Lamp, 26 W Lamp, 29 to 54 W Wattage, 120 to 277 VAC, 0.23 to 0.45 A, 50/60 Hz Frequency, Programmed Start, 0 deg F Minimum Starting, Total Harmonic Distortion: 10 %, Power Factor: >0.98, 2 Lamps, 4-Pin G24q Lamp Base, Ballast Factor: 1, Metal/Plastic, Black/Blue/Red/Yellow/White, 4.98 in L x 2.4 in W x 1 in H Dimensions