* Add on device compatible with Yale SR- Smart Home Alarm Systems and EF- Series Alarms * Activates the alarm when motion is detected * Wireless and easy to pair * 868 MHz technology Yale Smart Home Alarm System PIR Motion Detector EF-PIR. Looking for a wireless PIR motion sensor? This Yale Easy Fit Wall-Mounted PIR Sensor in white is waiting for you at OnBuy! This wireless PIR sensor from Yale gives you peace of mind and security at night. It's ideal for helping to increase security around your home.