Fangrui Product Details This Model Has The Function Of Automatic Conversion Device. When There Is No Device, The Default Is In The Bluetooth-compatible State. If There Is A Device, The Device Is Interpreted First. Music Format: Mp3/wma/wav/ape/flac Lossless Format Radio Fm Frequency: 87.5-107.5 Mhz Support Function Introduction: Support Mp3 / Usb / Tf / Line In / Fm / Bluetooth-compatible 5.0 / Remote Control Panel Size: 5x2.4cm Tf:connect Tf Memory Card (up To 32gb) Usb:connect Usb Flash Drive (up To 32gb) (shipment Without Card) Led Indicator Prev/vol-: Short Press Is To Select The Previous Song; Long Press Is To Decrease The Volume. For Play/pause: Short Press Is The Switch Between Pause And For Play; Long Press Is The Switch Of Usb / Tf / Fm / Aux / Bluetooth-compatible Sound, In The Radio Fm State, The Short Pause For Play Button Is Automatically Searched. Next/vol+: Short Press Is To Select The Next Song; Long Press Is To Increase The Volume. Support Mp3/wma/wav/flac/ape Support:mp3/usb (u Disk)/tf/line In/fm Power Supply