The Wattstopper UT-355-2 is a low-profile ultrasonic line-voltage ceiling occupancy sensor that delivers automatic on/off lighting control for medium-sized commercial spaces including open offices, classrooms, and break rooms. Rated for 100347VAC, it covers 1,000 sq ft using ultrasonic detection technology sensitive to minor occupant movement. Direct line-voltage operation eliminates the need for an external control panel, streamlining installation in standard commercial environments.