SABRE Wireless Motion Detector Alarm Sensor with 120 degree wide angle detection for use with SABRE WP-100 - DIY EASY to Install MAXIMUM SECURITY  fortify your existing Wireless Home Alarm System with this additional motion sensor that has a 120-degree angle of detection USER-FRIENDLY & SECURES LARGE AREAS  alerts the home alarm system when movement is detected; sensors can be placed up to 500 feet (150M) from main control panel ATTRACTIVE & CONSUMER PREFERRED  superior to other home security products, this premium white sensor looks great inside your home EASY INSTALLATION  no wiring needed (requires 1x9V battery, not included) EXTRA LEVEL OF SECURITY  provides battery status update with low battery indicator