Hubbell WS/ATP series wall switches combine PIR sensing technology, photocell control, and Hubbell`s patented three wire method to provide the perfect light switch replacement solution. These sensors do not require a neutral connection and they have no minimum load requirements. The WS series has manual timer adjustment while the ATP series incorporates Hubbell`s patented adaptive technology to automatically set timing and eliminate manual adjustments. The sensors come supplied with color matched faceplates. Manual-on versions are available for enhanced savings. Four wire models support installations that require a neutral connection. Also known as -Hubbell WS2000W H-MOSS Passive Infrared PIR Wall Switch Occupancy Sensor Manual