? MP3 Music player watch: Combined MP3, U-disk, voice recording and repeat functions into one player ? 30M water resistant, high accurate quartz movement ? High quality music and Hi-Fi quake-proof and skip-proof headphone ? 5 EQ control to meet your taste ? Voice recording ? Built-in rechargeable lithium battery ? Low battery consuming, playing time lasts for 8 Hours ? Storage capability: 128MB/256MB/512MB/1GB (optional) ? Firmware upgrade Frequency range 20HZ ~ 20KHZ Earphone out 4MW+4MW (16O) PC Interface USB1.1 (Max 600KBPS) Bit Rate 32KBPS-256KBPS System Os Windows 98/2000/XP/ME/NT Mac os 8.6 or higer Battery 150MAH/3.7V Lithium Rechargeable Battery Playing time 8 Hours Measurement 235mm Length, 17mm Thickness Weight 30g (Approx) (Including rechargeable battery) Water resistant 30M Japan movement Shock Proof and Anti-Static