The Echo Nano is a tiny digital audio player (DAP) made by Fiio. It’s small enough to fit in one’s palm, and in all but the smallest of pockets. It has no wireless connectivity of any kind, only a micro SD card slot and a 3.5mm audio jack.
This page contains some facts, quirks, and oddities about this player.
You probably won’t be able to just throw your library onto an SD card and use it straight away, depending on how it’s tagged. The software is quite picky about tags, and doing it “wrong” will just lead to it ignoring certain tags in certain places in the interface.
For the best chance of success, strip everything that isn’t necessary from the files. The safe tags are as follows: artist, title, album, track, and genre. You can try removing embedded art as well, especially since the art isn’t shown on the screen, though I’ve personally not encountered any issues because of it.
Unicode is supported, but the built-in font is somewhat lacking. It does have some of the more common non-ASCII scripts – Cyrillic, Turkish, and the west Romance languages are covered at least. Romanian understandably isn’t, though, so I decided to modify my badly-written program I use to transcode my library to mp3, to also transliterate everything to only ASCII characters.
While the firmware can properly decode track names, the library browser uses file names instead. (Even though album names are used rather than directory names, and the sorting key is the track number as opposed to the file names themselves.) I decided to make my file names be the same as the track names, without any track number prefix, although anything is fine as long as it doesn’t have too much fluff. It’s a very small screen, after all.