The QS1231-840 IQ Motion-S stands out as an encrypted PIR motion sensor that excels in both performance and affordability. Employing Qolsys' S-Line Technology, it ensures secure communication with the IQ Panel while maintaining backward compatibility with legacy 319.5 systems. With a pet immunity feature catering to animals up to 40 pounds, it offers versatile placement options, including flat surfaces or corners. Covering expansive areas up to 30 feet, it enhances security, supporting rule creation for automated responses and delivering peace of mind.