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Amazon.com: Ring Alarm Contact Sensor (2nd Gen) : Tools & Home Improvement
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Amazon's Ring unveils $40 device that detects breaking glass, duplicating Echo feature – GeekWire
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Amazon.com: Ring Alarm Contact Sensor 2-pack (2nd Gen) : Tools & Home Improvement
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Amazon.com: Ring Alarm Contact Sensor (2nd Gen) : Tools & Home Improvement
Ring Alarm Outdoor Contact Sensor | Ring
