Description LED: Digital display, shows red, color display; USB: Connect USB drive (supports up to 32 GB, not included) VOL-: Short press to select the previous track; long press to decrease volume PLAY/PAUSE: Short press to toggle between pause and play; short press in FM mode is automatic VOL+: Short press to select the next track; long press to increase volume MODE: USB / TF / FM / AUX / BLUETOOTH mode switching TF: Connect TF memory card (supports up to 32 GB, not included) Infrared receiver module Master IC: AC6926 Bluetooth IC: AC6926 Bluetooth version is version 5.0 Music Format: MP3 / WMA / WAV / APE lossless format FM Radio Frequency: 87.5-107.5 MHZ Supported Functions: Supports MP3 / USB / TF / LINE IN / FM / BLUETOOTH / remote control / DC 5V or 12V (optional) Regarding Structure: Panel size: 68 * 23 MM, the two corners of the panel and screw hole positions, then covers the surface, depth of the card is 32 MM Color: Black Material: Metal + Plastic Package Contents: 1* Decoder 1* Remote Control (without Battery) 3* Power Cable Set Only the above package contents are included; other products are not included. Note: Lighting and different screens may cause slight color differences between the object in the image and the actual item. Allowed measurement error is +/- 1-3 cm.