Mounting in a standard 4x4 electrical box, the surface-mounted CU Alarm is designed to work in conjunction with the Digital 1 operating control. Choose from 6 different alarm tones and 2 emergency tones. The CU Alarm should be installed outside the steam room in a location that will alert an attendant and/or user to an over-temperature condition. Mounts in standard 4x4 electrical box Outside the steam shower installation Installation and operation manual