Car MP3 Player FM Transmitter Card Slot Car MP3 Player FM Transmitter Card Slot1,Play MP3 and WMA songs 2,Read MP3 and WMA files from the USB flash disk or SD ... for you need 11,"-A" "B+"Key can switch on frequency, If you press the "-A", "B+"for a long-playing ... controller with 18 keys, It can play EQ effect, digital pick song and frequency16.Color:Black,Red,Silver,Blue,Yellow17.Accessories:CAR MP3 ...