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YL 333 Magnetic Anti theft Alarm for Door Windows 1 4 Inch Water Flow Sensor YF S402 Optocoupler Isolation: Relay driver circuit Optocoupler Isolation: Relay driver circuit includes optocoupler isolation to protect the ESP8266 from relay switching noise and back EMF This modular design allows seamless integration with popular flight controllers like Pixhawk 100% authentic product sourced from trusted Fast shipping
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