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Recessed Mount Magnetic Contact, NC, 17-25mm gap, D12x18.5mm  Features: Magnetic wired contact is designed for security systems to detect unauthorized entry. Recessed contacts are installed in the door or window frame, making them almost invisible. This is an aesthetic solution often used in residential premises. Due to its extremely small, compact size, this contact is suitable for installation in narrower profiles (e.g. aluminum or plastic window or door frames). It is also suitable for monitoring the status (open / closed) of drawers or other opening surfaces. The magnetic contact can be integrated into a smart home system, for example, to automatically turn on the lighting when the door is opened. Made of UV-resistant ABS plastic, ensuring durability. NC (Normally Closed) is a contact that is normally connected (closed) when the magnet is close. When the magnet is away, the contact disconnects, and the security system generates an alarm signal. The magnet is mounted on a moving part. Suitable for both residential and commercial security.  Technical specifications: Operation gap: 17-25 mm. Contact type: NC (Normally closed). Material: UV-proof ABS case. Installation: recessed. Cable length: 270 mm. Dimensions: D12 x 18.5 mm. Color: white.  Warranty: 24 months.