Product review (3 stars): Ups & Downs
This device is designed to help protect musical instruments from changes in humidity, temperature and shocks. It monitors the case and sends the information to an app on your phone. Bluetooth is required.

I inherited an expensive mandolin and was concerned about protecting it. While this device seemed to work,it is not for me. Set up was annoying and it took multiple tries before I got everything up and running the way it was supposed to. The range is limited and it is useless if your phone is not nearby. It goes through batteries at an alarming rate.

So while it does perform and the app, once running, is attractive, the limitations outweigh the benefits for me.