. The Yale PIR Motion Detector is wireless and easy to pair with your Yale Home Alarm System* allowing you to extend you system to tailor it to your individual needs.This accessory will activate the alarm when motion is detected.*Compatible with Yale SR- Smart Home Alarm Systems and EF- Series Alarms. Features . 868MHz Technology - Yale uses a frequency that is tightly controlled meaning a clearer channel with less interference.Connected - Connect to Yale SR Smart Home Alarm and EF Series Alarm Kits.DIY Friendly - Wireless and; easy to pair with your Yale Home Alarm System*.2 Year Guarantee - Guaranteed for 2 years from date of purchase.Batteries Included. .