An exclamation mark is used in Libratone App to send you a heads up.

We use the exclamation mark in SoundSpaces to inform you that:  

1. your products battery level is low (charging is recommended)
2. Wi-Fi signal strength on your speakers location is low (if you experience music dropouts - consider moving the speaker to a location with better Wi-Fi signal strength)
3. new speaker firmware is available

For information about what is being signalled - simply click the product.