CM 9 & CM 10 & CMR Series are Passive Infrared (PIR) Sensors with extended 360° range. Used for small rooms with drop ceilings and areas without obstructions. Features push-button programming, adjustable time delay, 100 hr lamp burn-in timer and green LED indicator. The sensor detects changes in the infrared energy given off by occupants as they move within the field-of-view. UL and CUL Listed. PDT Sensors are extended range sensors with Patented Dual Technology and Passive Infrared Sensor. Microphonics detection with 360° coverage. Features push-button programming, adjustable time delay, 100 hr lamp burn-in timer and green LED indicator. UL and CUL Listed. Sensors with Passive Dual Technology (PDT) first see motion using Passive Infrared (PIR) and then engage Microphonics to hear sounds that indicate continued occupancy. Uses Automatic Gain Control (AGC) to dynamically self adapt a sensor to its environment by filtering out constant background noise and detecting only noises typical of human activity. Place the sensor along the entrance door wall to prevent it from viewing out into the hallway, ensuring the sensor can view the entire room from this position.