Compact ,corret timing ,easy operation ,superior,cheap,practical ,reliable and les oppupation of space . Specifications: TYPESR3.81SR3.82Defrost Cycle/Day1-12cycles Adjustable1-12cycles AdjustableDefrost period2-60 seconds Adjustable2-60 seconds AdjustableCont Arr.Voltage16Amps,SPDT:220V 50HZ16Amps,SPAT:220V 50HZOverall Size120mmW x100mmD X188mmH120mmW x100mmD x188mmH SR Defrost Timer