All of our sensors utilize passive infrared (PIR) technology to detect changes in the infrared energy given off by occupants as they move within the field-of-view. As heat given off by the human body moves in and out of the beams, the detector sees this and triggers the occupancy mode. Our lens designs create a continuous array of beams that provide an even coverage. Additionally, we fine-tune our sensors to detect small motions even at great distances, while still preventing false trips. Microphonics� technology uses a microphone inside the sensor in order to hear sounds indicating occupancy in rooms with obstructions, such as bathrooms with stalls or open-office cubicle areas. By using Automatic Gain Control (AGC), the sensor can dynamically self-adapt to its environment by filtering out constant background noise and detecting only leading edge noises typical of human activity. Additionally, sensors with Microphonics use advanced digital acoustic filtering, so that the prolonged presence of persistent noises without any PIR events do not keep the lights on, nor do sounds with periodicity (such as from a time clock).