Scantronic 509r Wireless Smoke Detector

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The 509r is an optical smoke detector designed for the 500r+.
There are two components to the smoke detector: a 509 Transmitter built into a plastic adaptor ring, and the detector body itself.
When smoke triggers the detector it sounds its siren. The microphone in the 509 transmitter detects the sound and causes the transmitter to send a signal to the 500r+ or 500r control unit.