... -media USB mini speaker box 1,double play format MP3,WMA 2,high capcitive battery 3,FM radio,LED ... MHz87.5 - 108 MHzSensitivity75 Ω75 ΩMono, 26 dB signal to noise ratio2.8 microvolts2.8 microvoltsStereo, 46 dB signal ... to noise ratio61.4 microvolts61.4 microvoltsTuning frequency bands10 ... lithium multi-media mini speaker box,WMA,MP3 player