Ring Mailbox Sensor review: A simple premise with a clunky app - CNET
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Customer reviews: Ring Mailbox Sensor + Bridge – Black (Starter Kit)
How to Install Ring Mailbox Sensor
Pair with Ring Smart Lights to get notifications when motion is detected, customize settings, and connect to other Ring devices -- all from the Ring
Ring Mailbox Sensor – White (Bridge required)
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Ring Mailbox Sensor Review: The postman needn't ring at all