System Sensor’s i4 Series CO/PHOTOELECTIC SMOKE DETECTORS are compatible with the i3 series so CO monitoring can be retrofitted into existing i3 installations. The heads plug into the base with a Stop-Drop ‘N Lock action. Other features include a built-in 85dB sounder, LEDs that display CO and smoke status, Drift Compensation, and external IR LED that provides extended range sensitivity testing. Compatible with SENSRDR sensitivity tester. UL listed.
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