USA, Canada – Electronic Ballast for (1/2) F28T5 or (1/2) F21T5 or (1) F35T5 or (1/2) F14T5, Line Voltage: 120 to 277 Volt AC (±10%) 50/60Hz, Programmed Rapid Start, Series Lamp Operation, Active Power Factor Correction, Auto Reset after Lamp Replacement, End of Lamp Life Shutdown Circuitry, c(UL)us listed (Class P, Type 1 Outdoor)