Ring Mailbox Sensor is a battery-powered motion sensor that sends you real-time notifications via the Ring app when your mailbox opens

Article Title: Ring Mailbox Sensor is a battery-powered motion sensor that sends you real-time notifications via the Ring app when your mailbox opens

Snippet of Article: "...When connected to Ring Bridge, Ring Mailbox Sensor allows you to receive a real-time notification in the Ring app or via connected Alexa-enabled device whenever your Mailbox Sensor detects motion. ..." Reference: Amazon