The UW-100 ultrasonic wall switch sensor turns lights ON and OFF based on occupancy. It is characterized by high sensitivity to small and large movements, appealing aesthetics, and variety of features. The UW-100 fits in a single junction box. It uses Doppler Principle and high frequency (40kHz) ultrasound to detect occupancy and turn lighting ON. Once the space is vacated and the time delay elapses, lights automatically turn OFF. DIP switch settings allow for a variety of control options such as Auto-ON or Manual-ON operation, walkthrough, and test modes.