Wired Security Magnetic Reed Switch - No External Power Needed for Home Alarm System | DIY Home Security & Window/Door Sensor Alarm | Perfect for Smart Homes & Apartment Safety

1. Magnets are usually close to each other, which is normal.2. Close = short circuit = create a path for the current.3. The magnets are close together and the switch is off.4. And the switch and magnet are separated, and the switch is open.5. No external power supply is needed, and the GND and N.C ports of wired or alarm control panel are directly connected.Spec:Features:Magnets are usually close to each other, which is normal statement. Close = short circuit = create a path for the current. The magnets are close together and the switch is off. And the switch and magnet are separated, and the switch is open. No external power supply is needed, and the GND and N.C ports of wired or alarm control panel are directly connected. Not suitable for iron doors, it will reduce the magnetism of the sensor.Specifications:Working Distance: 15mm + 5mmSwitching Pressure: 100VDCLoad current: 300 mALife: timesSwitch Output: NC (Normally Closed)Package Weight: 91g/3.2ozPackage List:10 Pair * Door Window Sensor

The magnets are close together and the switch is off.

Close = short circuit = create a path for the current.

And the switch and magnet are separated, and the switch is open.

Magnets are usually close to each other, which is normal.

No external power supply is needed, and the GND and N.C ports of wired or alarm control panel are directly connected.