The Chord Poly is a great addition to the Mojo or Mojo 2 that allows the Mojos to add a micro-SD card reader and to stream from a variety of sources, including Roon, Qobuz, Tidal, internet radio stations, and other sources. Unfortunately, setting the unit up appropriately can take a fair amount of time, from reading the sparse PDF-only manual to searching the internet for the actual meat of how to do it. For instance, it’s not sufficient to simply insert an SD card with music files on them even if organized into albums. You have to manually create playlists or find an app for your particular smart phone that can create them, and even then it takes quite a bit of trial and error. The community of users can be quite helpful and friendly but it’s a shame that Chord doesn’t do as good a job at documentation as it does on making remarkable hardware. Similarly, to use some streaming services requires finding third party apps, again specific to your computer or smart phone, and getting them to find your Poly. The Roon integration is quite simple and painless if that’s the way you’d like to go. The battery life is quite long, as advertised. Overall, after getting all the set up working, it’s a wonderful addition to the amazing Mojos.