Dual-channel 3D sound, deep bass Mobile Speaker,MP3 Digital Play Built-in lithium battery,10 hours long play ... Dual-channel 3D sound, deep bassMobile Speaker,MP3 Digital Playexternal MP3 / computer / radio and other audio equipmentBuilt-in lithium battery,10 hours ... stereo radio, 60 channels can be stored stereo mini speaker with USB and MP3 digital play