Via the scan function the musicfly select selects absolutely automatically the next free radio frequency for music transfer it offers play back of numerous memory media a mp3 host function allows the wireless play bacl of up to 32gb music files from external usb memories or hard disks in addition it has a sd card slot and a mp3 player charging function the musicfly select transfers the id3 day information via the usb connection and indicates this on the display of the car radio