Supco edt10 adjustable defrost control 115 v, 1/3 hp, 10 amp features/benefits: universal replacement electronic circuitry adjustable defrost frequency 4 to 12 hours adjustable defrost time 10 to 35 minutes available in 115 & 208/240 volts standard size & mounting to fit most applications no ground wire quiet operation & durability dust proof case temperature range: 32 to 130f humidity range: 10-95% non-condensing