Products / Smart Home Alarm Systems / Smart Home Alarm Accessories / SR-EIR / External Motion Detector SR-EIR / External Motion Detector Monitors outdoors, powered with 868 MHz batteries.Compatible Alarm Kits:SR2100iSR3200iSR3800i BUY ONLINE Related products SR-PC/ PIR View Camera SR-PVC / PIR Video Camera SR-KF / Key Fob