... speaker support SD Card,U-flash, 3.5mm audio output built-in battery,7 hours mini size:300*45*45mm 1.5inch speaker ... of the following device:A,memory card,such as SD/MMC card,U-Disk,etcB,mobile device,such ... 589 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport resource:U-disk,MMC ... power: 5W(2.5w+2,5w)Loud speaker specification:1.5cm ,4ouhm,3wfrequency response:90hz- ...