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Features: Monitors the opening and closure of doors and windows. Normally closed with contacts are apart. Accuracy is accurate and reliable. With fine workmanship and excellent quality, it can be used for a long time. Ideal for metal door, window, commercial applications and where a wide interval is needed. Specifications:Type: Normally ClosedColor: SilverSensing distance: 23-35mm / 0.98-1.38inchMax withstand power: 10WMax withstand voltage: 100VMax withstand current: 0.5AShell material: Zinc alloyThread: 24AWG 320mm / 12.6InchWeight: Approx. 43gPackage Included:1pair x Magnetic Switch