GE240RSMVN-DIYB, Electronic 2 Lamp Ballast For The Following Bulbs: F40T10, F40T12, F34T12, F30T12, F30T12/WM, F20T12, Starting Temperature -20 Degrees Fahrenheit, Normal Ballast Power Factor, .87-.98, 9.5"L x 1.3"W x 1.2"H, High Efficiency Multi-Volt 120-277, Rapid Start.