$35 free shipping w/ Prime点我购买
Amazon offers Prime members the Chamberlain Wireless Motion Alert System, model no. CWA2000, for $35.11 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.03.) That's $4 below our April mention and the lowest total price we could find by $3. It features audio notification, 1/2-mile sensor range, weatherproof outdoor sensor with adjustable sensitivity control, and expandability up to four sensors.
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