* 16- to 328-foot protection range* Single-ended, reflective design* User-friendly alignment procedure* Six user selectable sensitivity levels* Optional integral NFPA 72 sensitivity test feature* Removable plug-in terminal blocks* Digital display for easy alignment* Built-in automatic gain control compensates for signa deterioration from dust build-up* Remote test station option* Paintable cover* Easiest alignment in the industry* Heater kits for transmitter/receiver and reflector option