MP3 mini speaker,PC speaker 1.suitable for the computer,PDA,,iPhone 4,the handset, ... ,the U plate,the SD card. 2.Small size MP3 mini speaker,PC speakerModel number:MA81221.Digital MP3 Player: TF card direct ... power:3W*2(RMS)2.Frequency:100Hz-18KHz 3.Inside speaker:3W*2 4.Input power:DC 5V 500mA5.Audio signal ...