Bought the wrong sensor for our alarm, unboxed and unable to pair correctly - otherwise unused. The Yale Pet PIR Motion Detector Sensor is designed for Yale SR & EF Alarms, operating at 868MHz. It is a pet-friendly sensor that detects motion and is suitable for use in homes with pets. The sensor is powered by batteries, which are included with the product, making it easy to install and use. With its white colour and compact design, this PIR motion detector seamlessly integrates into any home security system, providing added peace of mind for homeowners.