This exiting new player boasts a revolutionary rotating volume control disk that makes for intuitive interaction with this machine. The impressive aluminium body sports a dual earphone socket which means you can now share your music with friends also brilliant for those long and boring bus or train rides. Now with support for ogg vorbis files included this becomes an mp3 player that warrants serious consideration. Specifications Audio Frequency Range 20Hz ~ 20KHz Headphone output - Ear Jack1:(L) 12mW + (R) 12Mw (16 Ohm) Volume (Max) - Ear Jack2:(L) 8mW + (R) 8Mw (16 Ohm) Volume (Max) S/N Ratio 90dB(Based on Ear Jack 1) FM Tuner Frequency Range 87.5MHz ~ 108MHz Headphone output - Ear Jack1:(L) 12mW + (R) 12Mw (16 Ohm) Volume (Max) - Ear Jack2:(L) 8mW + (R) 8Mw (16 Ohm) Volume (Max) S/N Ratio 50dB(Based on Ear Jack1) Data Storage USB Function Mini A-type plug USB V1.1 USB Host Mini A-type plug USB V1.1 File Support File Type MPEG 1/2/2.5 Layer 3 WMA Ogg Vorbis MP3 Encoding 8Kbps ~ 384Kbps Tag Support ID3 Tag Ver 1.0 2.x support Lyrics MediaSync support General Size 84.5mm(W) * 42mm(L) * 23mm(H) Weight 56 g Operational temperature -5¦C ~ 40¦C Memory 256MB / 512MB Playback hours 17 Hours Voice recording Over 130 Hours (Based on 512M & 8Kbps) Battery Built In Li-Polymer Battery