The PYR-4122 is an analog hardwired pet immune passive infrared motion detector with a high stability intrusion sensor. The PYR-4122 utilizes high-temperature compensation and unique low-temperature compensation for maximal detection capabilities and minimal false-alarm transmissions. The PYR-4122’s pyroelectric sensor is enclosed in a sealed chamber, protected from insects and air drafts. For additional security, the unit is supplied with a cover tamper which detects tampering with the sensor if the case is opened.