The Etlin-Daniels SENPIR-CM-01 ceiling mounted PIR occupancy sensor is designed to replace a standard light or fan switch. It is ideal for applications including private offices, conference rooms, break rooms, washrooms, classrooms, lounges and storage areas. The Etlin-Daniels SENPIR-CM-01 with built in (Auto ON/OFF) detects changes within the infrared given off by occupants as they move around the field-of-view. When occupancy is detected, the self-contained relay, switches the lighting load on. The sensor is line powered and can switch line voltage. Windows, glass doors and other transparent barriers may obstruct the sensor's view and prevent detection. Time delay Adjustment, fixed 15 seconds to 30 minutes. Tools required for installation insulated screwdriver and wire strippers.