The Cowon X9 player from Cowon / iAudio has an amazing battery life. The lithium polymer battery of this player offers up to 110 hours of music and 13 hours of video.Compatible with many formats, the Cowon X9 also reads TXT files and ID3 Tag information on artists and albums. This device includes JetEffect 5 with 44 presets and 4 customizable modes to suit all styles of music.