Amazon.com: Ymiko Door & Window Sensors, 5pcs MC-38 Recessed Wired Door Window Sensor Magnetic Switch Home Alarm System for Wooden Door, Window : Tools & Home Improvement
Gebildet Plastic Reed Switch Reed Contact Closer (N/O) Magnetic Induction Switch (3 mm x 14 mm) with 20 Small Round Multi-Purpose Magnets Pack of 10 : Amazon.de: DIY & Tools