Mini speaker-USB laptop desktop computerConnection method; USB Frequency response range; 100HZ 20KHZ Output power; 2*3W Signal to noise ratio; 70db Power supply mode; USB direct power supply Channel; 2 Play time; unlimited Extended storage; not supported Bluetooth protocol; no Bluetooth Number of speakers; 2 Operation mode; button Play format; MP3, WMA, WAV, FLC, APE Shell material; plastic Speaker adjustment method; button Is there a radio function; Box material; plastic Appearance size;