[quote="Tom_Ring, post:2, topic:243338"] Upon opening the Ring app, you should see low battery notifications. As a good precaution, you should replace batteries every few years. [/quote] The batteries were fine, it’s only 3 months old system. I got no notifications of low batteries. Upon removing the batteries on all 3 sensors, then refitting the same batteries, all 3 sensors came to life and showed full battery level. My concern is that I didn’t know they were offline, got no notification to say this, and didn’t know until went to arm the system. Could say that’s ok then, but not when you’re going out the door, expect to arm system, and don’t have time to fault find. Why didn’t Ring email, send me notification etc, that 3 paired sensors have been offline for 3 weeks. Not good.

Hi @L1111. Currently, the Ring app doesn't send a notification for when a device is offline. Neighbors have requested this option, so I'd recommend adding your vote and feedback to [this post](https://community.ring.com/t/notification-of-device-offline/4360) on our Feature Request board. This helps us to gauge interest in new features or products and share that feedback with the appropriate team.