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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
Amazon.com: Gebildet 3pcs Recessed Wired Security Window Gate Contact Sensor Alarm Magnetic Reed Switch Black,Magnetic Door Sensor, Normally Open Magnetic Switch : Everything Else