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elchal-li Thisis transmitter only. You can plug it on the line out connector, and listen to the music via Bluetooth on your BT headphones. It doesn't matter you have or not a microphone, because it will not be connected.

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elchal-li If you see the schematic, you can drive a relay with the sensor and a transistor. Then you can use the normally closed contact to manage the light as you say.

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