Introduction: The PA-406 digital motion detector combines a patent-pending circuit design, dual-optic sensor design, an interlaced pet-friendly lens pattern and advanced digital processing technologies to differentiate between people and pets while maintaining superior coverage.

The lens and sensors ensure that pets do not generate the signals required for an alarm situation. Since the signal is converted, amplified and processed in the digital domain without any analog circuitry, the parameters of the complete signal are analyzed by sophisticated software algorithms and compared to a bank of movement signals. This allows the motion detector to precisely identify an alarm situation and prevent false alarms.
 
Pet Immunity: An object must simultaneously cross the beams of both the upper and lower sensors before a signal is determined to be a potential alarm situation. Since pets do not have the height or mass to cross the beams at the same time and generate the required signal criteria, they will not cause false alarms.