Easily installed in standard 2-1/2"D vertically-installed junction box. Spring-wound mechanical dial, open in the off position to permit fan operation from standard pull switch when not in use. Operates with 1 HP motors and standard household current of 115 Volts, 60 Hz, single phase. Includes durable plastic knob and wall plate marked in 2-hour increments. Equipped with continuous-on hold feature.