Opus #1s is a high res portable music player. New 2018 version, it uses new dual high performance CS43198 dacs for better specs and performance all around. Opus#1s also has a higher output than many portable players, allowing it to power most full size headphones really well.
Opus #1s is for people with their own music library - it does not stream, have apps or bluetooth.
With the improved power and new dacs the specs are impressive: SNR is 123 db, crosstalk is 140 db, output of 3.1v. The battery is a huge 4000mah to provide 11 hours playback time.
The UI is simple and clear, easily the most straightforward to learn and use in its class, with a bright, crisp 480 x 800 4" screen. Housing is polycarbonite (ABS), weight is 190g and it has a solid feel.