Dual INF surface mount control assemblies with weatherproof box for exposed exterior locations. For 120 volt applications must use item #14-4125. For 240 volt applications must use item #14-4225. Includes gang box, stainless steel face plate, and weatherproof box. 15 amp maximum load. The INF input regulator is considered an "Infinite Switch". It operates with a bi-metal contact. It pulses the heater on and off as the internal contact heats up or cools down. It is considered a coarse form of control and is commonly used for electric heaters.