The Qolsys QS1231-840 IQ Wireless PIR Motion S-Line Sensor is an encrypted PIR that is as powerful as it is affordable. Leveraging our proprietary S-Line Technology it encrypts signals sent to the IQ panel while still providing support for legacy 319.5 systems. Pet immune up to 40 pounds, the IQ Motion-S is designed to mount on a flat surface or in a corner, and at a variety of angles.