If your iPhone's sensors aren't working correctly, you may need to calibrate them. Here's how to calibrate an iPhone's brightness and motion sensors.

Some motion sensors are based on optical measurement technologies to provide accurate velocity and position measurements without requiring physical contact with the object or surface being monitored.

Ours is roughly 30 feet away and I didn't have any problems. View a history log in the Ring app to see when the sensor detected motion, and when it stopped detecting motion.