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The Notifier SD-651 Plug-in Smoke Detectors offer superb performance and reliability in a profile which is just 2” (5.1cm) deep. Model SD-651 (photoelectric sensor) can be used
with a variety of different adapter bases in several wiring configurations and voltages. Other features include: low current draw, stable performance in high air velocities, built-in
tamper resistant base design, remote LED option, removable cover, and built-in test switch.

e design, remote LED option, removable cover, and built-in test switch.