NO Magnetic reed Switch Normally Open N-O Wired Door Window Sensor

1. Actuation Distance : 15 – 25 mm;
2. Connecting cable length: 30 cm.
3. Magnetic sensor alarm, control the switch of the circuit via the built-in magnet
4. Alarm when someone intrudes into your places
5. Can be used in places like apartment, hotel, office, etc.

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The piece with the wires contains a reed switch that moves in response to the presence or absence of a magnetic field.
The other piece without the wires contains a magnet, so it can activate the reed switch when the two pieces are close to each other.