... also avialable. product feature Part number:SG-589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource ... DC 5v/Li battery,1000MAH,7--9hours.function:music files player/loudspeaker/color:silver,black,etc technical parameter: Output power: ... 5W(2.5w+2,5w)Loud speaker specification:1.5inch(φ40mm) ,4ouhm, ...