The strength of W810i is its ability to playback music with quality that is almost as good as its dedicated WALKMAN counterparts. Navigation is very similar to the iPod: songs can be selected according to artiste, album and play list. The W810i supports a wide selection of audio formats including MP3, MP4, 3GP, AAC, AMR, MIDI, IMY, EMY and WAV (16kHz maximum sample rate). Even with just one speaker, volume output was loud enough to match the dual-speaker configuration found in the W600i, but where fidelity was concerned, the W810i was not as lively because 'Stereo Widening' is not available.



Link: HardwareZone