Plug In Compact Fluorescent (CFL) Ballasts where Number of Lamps is 1, Input Volts is 120V, Lamps by Wattage is 1 X 35W - 39W, Length is 5" - under 10", Max Current is 0.15 - 0.29 Amps, Start Type is Instant, Width is 1", and Ballast Lamp Type is 4-Pin