... decoder -memory function:volume,FM frequency TF card,USB,AUX Decoder Board with FM radioStrang decoder: TF card,USB,AUX MP3 Decoder Board, pcb ... Option Antenna wire OptionMore information:-Supporting TF Card and USB disk to play music, with AUX-Support MP3,WMA format-With FM radio ... the standby mode when you press this button. SD card decoder board: SW-005 TF card,USB,AUX Decoder Board with FM radio