Super lightweight, and perfect to showcase your music. Mobile HIFI (note the compression of files becuase means all defects). But with Cowon J3 player and a helmet type V JAY'S or even better AKG Q701 is the sublime. Very good dynamics, excellent rendering spatial, distortion-free amplification, silence and impressive pianissimo for an amp so small. And he fishing - it moves !!! It's like being in the studio on the day of registration - Really Definitely recommended especially for its very light prices. Only gripe: you must reload the all read about 7am. (It's not bad) Cowon easily keeps him on 10 or 11 am on a charge. You can also connect to any smartphone player, tablet, laptop, etc .. (but be careful it does not qu'ampli DAT)