The WSD PDT Series is a Wall Switch Decorator style Passive Dual Technology (PDT) occupancy sensor. The combination of Passive Infrared and patented Microphonics detection allows this sensor to literally see & hear occupants. It is ideal for restrooms with stalls, private offices where occupant turns their back to the sensor, or rooms with obstructions. FEATURES:• Patented Dual Technology with PIR / Microphonics Detection• Self-Contained Relay - No Power Pack needed• Interchangeable Hot & Load Wires• No Neutral Required• No Minimum Load Requirements• Small Motion Detection up to 20 ft• Self-Grounding Mounting Strap• Compatible w/ Electronic & Magnetic Ballasts, CFLs, LEDs, & Incandescents• Push-Button Programmable w/o Removing the Switch Plate• Adjustable Time Delay• Non-Volatile Settings Memory• Green LED Indicator