... power exausted. Long time battery lifeLine-in function, Compatible with all the devices that have 3.5mm plug. Spring column ... >80db6.Distortion<0.5%7.BatteryBuilt-in Li-Battery with circuit protection(300ma)8.Mains input5v/500MA Desk Lamp ... photoes:Recommendation...bluetooth speaker, mini speaker, speaker, toy speaker, patented speaker,portable speaker, for iphone ipod speaker,mini speaker products ...