The plug-in DuctStat Temperature Sensitive Switch simplifies installation of inline duct fans by eliminating electrical connections at the furnace. Year round use, automatic on/off for heating/cooling with an adjustable temperature range. Can also control any 110V (volt) device (alarms, heat lamps, lights, dampers, fans) that you want to activate because of temperature rise or temperature fall from ambient. Mounts on duct or wall. 5A (ampere) maximum load. 6 foot long power cord with a grounded plug. Power cord and panel outlet are 3-prong grounded. Housing is made of high strength ABS (Acrylonitrile Butadiene Styrene)-Polycarbonate, flame retardant alloy. ETL Listed.