... battery,500mAh/DC 5v 1.5"speaker,3W*2 the functions and the advantages of our mini speaker1,it can play music ... than other supplier. product feature Part number:SG-339 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U ... technical parameter: Output power: 5W(2.5w+2,5w)Loud speaker specification:1.5cm ,4ouhm,3wfrequency response:1000hz-20khzsound&noise rate ...