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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 6-PCS or 10-PCS5Sets 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