Automatically turns lights on and off. Works with all bulb types. Optional vacancy mode (manual on). For use with 600W (watt) incandescent, ELV (extra low voltage), or halogen. Also compatible with 450W MLV (magnetic low voltage), 360W CFL (compact fluorescent), LED (light emitting diode), 5A (amp) ballasts, and 3A fans. 900 sq ft coverage, 180 degrees field of view.