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This is our Standard wireless door/hatch contact, for use inside the vessel which is part of the GOST GOST Phantom & GOST Insight Systems. It is a Wireless Contact sensor that has a built in magnetic switch as well as a universal input that works with any of our available extension sensors below. Additionally, it has a built in anti-tamper switch for extra protection. Features: Wireless range in a typical marine environment: 30m (100ft) with GOST GOST Phantom or GOST Insight that can be extended to 60m (200ft) with the Wireless Repeater Low battery and signal transmission Dimensions: 11cm x 3.2cm x 2.5cm (4.4in x 1.3in x 1in)