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What are the dimensions of the DSC EV DW4975 contact and magnet?

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The transmitter is 2 1/4” x 1” x 15/64”. The magnet is 1 ¼” x ⅜” x 15/64”. This contact is designed to work in areas that have a small space for installation. They are also favored by people that don't want a bulkier contact that may be more visible to the naked eye.