... ,frequency range: FM: 76 -108MHZ4, excellent tone quality,with wallyson dual channel stereo.5, Dual power supply ... lithium battery and USB power6, It is convenient for your travel ,portable, super slim and mini size ... Speaker:whole tone1.5" 4Ω 5WFrequency Response: 180Hz ~ 18kHzSNR:≥85dB Cheap Speaker,2012 hot sale active mini speaker speaker multimedia speaker sports mini speaker creative speaker ...