http://www.gadgettown.com/M720-Wired-Passive-Infrared-Detector-E01571.html
This is MX-720 Wired Passive Infrared Detector. High density design. Optional other lenses. Compact size and streamlined design is ideal for the security applicationAdopts self-designed DSP chip with patented frequency adjustment calculation technology. High sensitivity dual-element passive infrared & artificial intelligence. Wired, wireless, bus compatible, MA bus mode.