... service 3,USB/SD 4,Pefect for MP3,TV,DVDmore mobile speaker mini speaker, computer speaker, Selling point:Extendable bass ... Li-ion battery: big capacity and long playtime.Compatible with: Mobile, MP3/MP4, laptop/desktop, iPod/iPhone, CD/DVD etc. ... computer speaker gifts and other promotional items Load power2.2WBass boost / attenuation85db peak power 2.4Wtweeter 95Lift/high attenuation 89Horn ...