QMseller Recessed Security Alarm Contacts Door Window Sensor Magnetic Reed Switch White 4Pcs cocoon Feature: 52 x 26 mm

Feature: 52 x 26 mm color LCD screen

20 inch Please Note:The Bargains Depot stylus have a small rubber tip

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QMseller Recessed Security Alarm Contacts Door Window Sensor Magnetic Reed Switch White 4Pcs cocoon Feature: 52 x 26 mmQMseller Recessed Security Alarm Contacts Door Window Sensor Magnetic Reed Switch White 4Pcs Size: NC 4pcs Switch Type: NC means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ). For example: Install on the door, close door light on. open door light off. When make order, pals check carefully! The reed switch is an electrical switch operated by an