Description Product Reviews Optex SL-350QFRI iSeries Advanced Outdoor Wireless Photoelectric Quad-Beam Detector 350′ Range Optex expands on its industry leading outdoor battery-powered iSeries line by adding the quad beam SL-350QFRi, a 350′ battery-powered photoelectric detector requiring no trenching or wiring. Because of this, Integrators and Dealers can offer a significant cost saving alternative to traditional hardwired systems, while end users will benifit from less downtime to business operations during install. The iSeries SL-350QFRi includes an Inovonics EN1941 wireless transmitter pre-installed, and comes with four batteries per set, with the option of expanding to eight for up to 10 years of battery life. In addition, the SL-350QFRi is compatible with the AX-TW200 line of beam towers for a clean, concealed, wireless mounting option. The SL-350QFRi is the perfect solution for perimeter protection where labor costs or trenching is an issue. Main Features 350′ Detection range, quad beam detection 4-Channel selectable beam frequency D Cell lithium batteries included, 4-8 year battery life Sniper viewfinder for easy alignment D.Q. Circuit IP65 0 Reviews Hide Reviews Product Reviews