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Door contact window contact in 9 variants and colours (diameter 19 x 23 mm, brown). : Amazon.de: DIY & Tools
Amazon.com: Gebildet 2set 100V-240V Recessed Security Window Gate Contact Sensor Alarm Magnetic Reed Switch with Blue Wire,Normally Open Magnetic Switch : Electronics
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Gebildet 2set 100V-240V Recessed Security Window Gate Contact Sensor Alarm Magnetic Reed Switch with Blue Wire,Normally Open Magnetic Switch : Amazon.sg: DIY & Tools