Stereo speaker 1.With SD/MMC Port 2.Volume Control 3.Earphone port 4.It's also your MP3,U-Disk Stereo speakersound boxspeaker box ... Dimension60(D)*60mm(H) (Single) Selling Point*Connect to your iPod,iPohe,MP3, MP4, Laptop, PC, MD, Mobile Games,etc* ... rechargeable li battery,enabling more than 4 hours’ performance*With SD/MMC Card Port;*With Earphone Port*With Volume Control,Led indicator Package ...