25pcs Magnetic Reed Switch Door Window Contact Sensors | Wired Security Alarm Sensor for ArduinoBuild or expand your security and automation setup with this 25 piece magnetic reed switch sensor set. Designed for doors, windows, cabinets, and other entry points, these wired contact sensors are ideal for alarm systems, Arduino projects, DIY electronics, and home automation applications. Each sensor uses a normally closed magnetic reed switch design and comes in a compact white housing for a neat and simple installation. The sensors can be mounted
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25pcs Magnetic Reed Switch Door Window Contact Sensors | Wired Security Alarm Sensor for Arduino