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The Optex Wireless 2000 driveway alarm system typically comes complete with one (1) Optex TD-20U wireless driveway sensor and one (1) Optex RC-20U driveway alarm chime. Each Optex driveway chime is capable or receiving alert signals from up to 12 of the wireless driveway sensors. Purchase this bundle system and receive a kit complete with TWO (2) Optex TD-20U driveway sensors!
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