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It uses an Infrared beam that is returned from a reflector mounted on the opposite side of the opening that detects vehicles in the beams path
second if the loop circuit is shorted
Seco-Larm Enforcer E-931-S50RRGQ (On Sale)
Litmaster® 61LM
Two-wire pulsed (2 freq)
Access One FLB100-Mini Emergency Access Fire Box Liftmaster LA400 It uses an Infrared beamCLICK HERE FOR BROCHURE CLICK HERE FOR MANUAL Access One FLB100 Mini Fire Box Always check with your local Fire Department for compatibility before making a purchase The Fire Lock Box Series allows emergency access through automatic gates and pedestrian doors. The universal design works with both Knox Locks and padlock applications allowing Dealers and Distributors to stock a single box. It is available in a standard size and streamline size to blend
