The Wattstopper DT-300-U is a low-voltage ceiling-mount dual-technology occupancy sensor operating at 1828 VDC/VAC with 360 coverage up to 1,000 sq ft at mounting heights of 812 ft, designed for commercial ceiling tile, 4-in octagonal J-box, or surface mounting. It combines PIR and patented 40 kHz ultrasonic diffusion detection, includes an isolated relay output compatible with BZ Power Packs and Wattstopper PLUS Sensor Interface Modules, and features DIP-switch adjustable time delays (30 sec to 30 min), light level sensing (10300 fc), test mode, and walk-through mode. Listed to UL, cUL; BAA/TAA compliant; USA manufactured; 5-year warranty.