Remote Bulb Controller, Regulates Temperature of Air or Liquids in Ducts, Pipes, Tanks and Boilers, 120Vac or 240/277Vac, 55-175 Degree Setpoint Temperature Range, 200 Degree Maximum Operating Temperature, 3.6 Degree Fixed Differential Temperature, 3.6-12 Degree Interstage Differential Temperature, 1/2"x3 9/16" Copper Bulb, 20' Capillary Length, 2 SPDT Output, Can be Mounted in any Position