Round Shape Portable speaker, Multimedia speaker, portable speaker, Mobilephone MP3 speaker,computer ... :MP3 speaker: 1.card reading function,can read USB/SD/MMC card 2.USB plug,can play MP3 audio fileMP3 speaker introduction ... battery 1000mA/3.7V*many interfacesAccessories: 1pc audio cables,1pc USB cable Lithium battery 1000mA/3.7VProduct specification:1.Consumption amplifier ...