Specification sd card sound box: 1.LED display 2.Remote control 3. ... Lin-ion 4.USB cable/remote contr Features:This sd card sound box can link to MP3, MP4, Notebook, CD, DVD ... support: MP3/MP4, computer, music mobile & iPod, etc3)Stereo sound design, excellent ultra-low sound4)High-efficiency digital Amplifier, enjoy ... rechargeable battery & USB power supply (5V, DC) sd card sound box sd card sound box