Abode Systems Inc. Motion Sensor detects movement when the system is armed in "Away" mode to alert you to any movement while you are gone. It's perfectly suited to be installed in large rooms with many windows, hallways, or entryways. Advanced intelligence designed to prevent false alarms. Wide detection keeps you protected with 110° field of view and 35 feet of range. Long battery life of up to 5 years. Built-in LED to test optimal placement and alert you to faults.