Gro-Control Thermostat 1 For use with Rubber Propagating Mats. Can be set from 40 to 100 deg. F. and control soil temperature within 1 deg. F. of thermostat setting. Comes with 6 ft. grounding cord. 120 volt, uses 720 watt max. GC-1 handles 1 to 2 mats, (must adapt receptacle to handle more than one plug). Ship wt 3#