Leviton OSC10-M0W Ceiling Mount Occupancy Sensor, White Small Size: Installed sensor appears almost invisible Accurate, consistent switching: occupant complaints are eliminated; lights are on when room is occupied, off when empty. annoying false-offs are minimized and lights on at night is eliminated. Fast simple installation: easy ceiling mount, three wire connection (low voltage) and twist-lock sensor attachment Ambient light recognition: the photocell prevents lights from turning on when room is adequately lit by natural light. Maximum reliability, low cost: all digital circuitry uses a minimum of components.