MP3 mini speaker,PC speaker 1.suitable for the computer,PDA,,iPhone 4 ... U plate,the SD card. 2.Small size MP3 mini speaker,PC speakerModel number:MA81221.Digital MP3 Player: TF card ... MP4, mobile phone, PC, etc. 5.External high-performance rechargeable lithium-ion battery. 6.Multi-function keys: volume, selections, ... 3W*2(RMS)2.Frequency:100Hz-18KHz 3.Inside speaker:3W*2 4.Input power:DC 5V 500mA5.Audio ...