1. Detection range: outdoor 80m .With selectable 8-channelbeam frequencies. 2. Powerful and reliable twin beam detector. 3. Easy optical alignment with LED indication. 4. Adjustable beam interruption period(50~700msec). 5. Form C relay providing more applications. 6. Up to 8-sets for multiple installation. 7. Anti-Forest design. 8. Lighting & surge protection, Automantic gain control circuit. 9. Target yellow color, tuned to the peak wavelength of humanvision,to be easily targeted in the beam alignment.