Among the most technologically advanced detectors available, the WS4904 Pet immune Motion Detector achieves superior detection and false alarm prevention through digital signal analysis. Digital information is more accurately analyzed using software and is not subject to signal degradation caused by amplification, noise, distortion or signal clipping. The detector's technology adapts to changing environmental conditions by adjusting critical detection parameters to provide improved consistency of detection over all temperature ranges. Pet owners looking to be protected from false alarms can choose the WS4904P model version, a detector that is immune from pets weighing up to 60 lbs (27 kg)._x000D__x000D_Patented Multi-Level Signal Processing (MLSP) provides for more accurate detection of human IR energy over a broad range of temperatures. It's able to maximize catch performance while providing protection against false alarm sources such as radio interference, air vents and insects. Built with reliable 433 MHz technology, the detector features the latest low-power RF technology to effectively extend battery life. The PCB antenna design provides for more consistent performance and better coverage and sensitivity._x000D_Pet Immune Motion Detector Main Features_x000D__x000D__x000D_ WS4904P replaces the WLS904PL-433_x000D_ Based on the Bravo 3D hardwire motion detector_x000D_ High-traffic shutdown_x000D_ WS4904P features pet immunity up to 60 lb (27 kg)_x000D_ 1 lithium battery included_x000D_ Reliable 433 MHz technology_x000D_ Digital signal analysis for consistent detection throughout the coverage pattern_x000D_ Exceptional catch performance at elevated temperatures_x000D_ Patented Multi-Level Signal Processing (MLSP) for accurate detection of human IR energy over a broad range of temperatures_x000D_ Temperature compensation_x000D__x000D_