The CM-9 Series occupancy sensor offers amazing performance and sensitivity to small motions for a standard Passive Infrared (PIR) Ceiling Mount sensor. Ideal for small rooms with drop ceilings and areas without obstructions, the CM-9 is a snap to install. Its light weight allows surface mounting to drop ceilings or a ceiling grid. The CM-9 sensor can cover entire private offices or smaller rooms by itself,however it is also the ideal lead sensor for odd shaped rooms. For example a CM-9 in a restroom vestibule can communicate with a CM-PDT Dual Technology sensor in a main stall area. LT option for low temperature/high humidity. Operates down to -40F. For mounting above 15 feet.