portable SD card mini speaker

Features: -New technology of SD-card storage processing. -USB connect,support independent date mutual-transfers. -support windows Mac OS10*vista SP2 system. -One-key intelligent control:pause.play,forward,next,volume++/-power on /off . -MIC(microphone)voice input.Headset mute control. -Applicable to call phones,MP3,MPP4,Notebook,desktop or pocket pc ,MD and other digital device. -Unique patented technology-speaker in series infinite,bring you stirrying feeling. -Unique inverted micro-hole design,low-frequency better. -Reddot archetype come from gentlefolk,three-dimensional solid prominent technology . -40MM- caliber speaker.3W output -Built-in high capacity rechargeable lithium batter,multiple circult protection,it can play continuous more than 6 hours. Descritpion: Model:N1 Dimension-(L)60MM*(H)53mm Net weight-90.3g Speaker -40MM Input-L/R320mV Power output-3W S/N-more than80dB AMP FREQ RANGE-200HZ-16KHz Charge Voltage-5v+0.5v Temperature--0°C-40°C Operating systerm --Microsft windows Vista,XPSP2 ,Mac Os 10* Audia playback format--mp3 and WMA