Ecolink Wireless Door/Window Contact Zigbee Wireless Door/Window Contact, White (4655BC0-R) Price: $19.95 (as of 06/10/2022 23:32 PST- Details) & FREE Shipping. Details

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Small, Sleek design: Wirelessly monitor your doors and windows with these small, highly reliable sensors, designed to fit unobtrusively into any home environment.
Spacers included: to ensure optimum contact between the sensor and the magnet, 2 optional spacers are supplied to accommodate all door and window sizes.