... service 3,USB/SD 4,Pefect for MP3,TV,DVDmore mobile speaker mini speaker, computer speaker, Selling point:Extendable bass chamber ... Li-ion battery: big capacity and long playtime.Compatible with: Mobile, MP3/MP4, laptop/desktop, iPod/iPhone, CD/DVD etc.Available ... to order. Specifications:Rated power: 2WSNR≥89dBFrequency response: 150-20KHZSpeaker drivers: 3.6 cm, 2W/4ΩOutput: 4.2V/250MASize: 52 ...