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5Sets Magnetic Reed Switch, Magnetic Door Switch/Magnetic Contact Switch/Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light Black industrial Rsepvwy Active Stylus Pen:Best Choice5Sets Magnetic Reed Switch, Magnetic Door Switch Magnetic Contact Switch Normally Open Closed NC NO Door Alarm Window Security, for DC 5V 12V 24V Light MAGNETIC REED SWITCH INSTALLATION INSTRUCTIONS 1: The door and window magnet should be installed at the closed position of the door window 2: The magnet part is installed on the movable door and window. The switch part is installed on the fixed door and window frame. The switch part and the magnet part