Product review (2 stars): Sad because normally D'Addario is a top notch company
This product is not ready for the market.  I have three.  Two actually work.  Connection via Bluetooth is hit or miss.  Installing a new battery does not seem to help.  Neither does calling customer support.  I have never had all three functioning properly at the same time.  If two work, one doesn't.  No rhyme or reason. Just random fails.  I have 10 guitars and was going to use this to monitor the conditions of all.  Just too finicky.  Sad because normally D'Addario is a top notch company.