84. STARTUP4.1. FMPress M key to choose FM mode.Automatic Search: long press to start the automatic channel searchand the system will automatically save the available radio stations.Manual tuning mode: long press or to enter the manual tuningmode; and then short press or to adjust the current channel.After no key operation within 5 seconds, it will save the currentchannel and leave manual tuning mode.Mute: short press to mute FM playback.Channel selection: short press or to navigate through savedchannels.Volume control: short press + or - to increase or reduce thecurrent volume.4.2. SDPress M key to choose SD mode. If there is no SD card, the display willshow “NO” and flicker. If files are not supported or there are no files,the display will show “----“.Play control: to play/pause. Short press or to navigatethrough songs. Long press to fast forward or fast reverse.Volume control: short press + or - to increase or reduce thecurrent volume.