Leviton ODC Series 1000 Sq. Ft. Multi-Technology Ceiling-Mount Line Voltage Dual Relay Occupancy Sensor with Intergrated Photocell Auto-Adapting: Time delay and sensitivity are continually adjusted to occupancy pattern of use Time delay and saved settings are protected during power outages and will return to the last known state Industry-exclusive self-configuring local manual switch input: Momentary or maintained switches are supported Industry-exclusive "fail-safe" circuitry: Return-to-Closed feature causes relay to default ON, eliminating life safety concerns if product fails Adjustable Time Delay: 30s, 5min, 10min, 20min, 30min Operating frequency : 50/60Hz