... optional 3.Support folder switch 4.Memory function Car MP3 FM transmitter AD-658 features:Built-in Flash memory,1-4GB ... modeNormal,Rock,Soft,Jazz,POP,Classical,DBBBit rate16Kbps 320KbpsFM Frequencies87.5 to 108.0MHzChannel SettingPress CH key or use the ... controller to selectSNR85 DBHAR distortion≤0.05%(FM<0.1%)Working temperature-5°C-40°CAvailable distance<5M-8MOperating systemWindows ...