Specifications A.mini mobile SD card speaker B.Digital amplifier C.plug it can ... power HM-705Product Description:SpecificationsA.mini mobile SD card speaker B.Digital amplifier C.plug it can play ... power source E.OEM 1.portable SD card speaker,mp3 speakers,computer speakers2.Connect to your MP3 ... directly6.No battery or power supply is required7.Stable speaker to set up base on the desktop8.Interated , ...