ITEM NAME:Bluetooth decoder board MP3 lossless car speaker amplifier modified Bluetoo S4U1 Bluetooth decoder board MP3 lossless car speaker amplifier modified Bluetoo S4U1 Power Supply 3.7-5V SNR 90dB THD+N -70dB Crosstalk -86dB DNR 91dB Support Profile A2DP/AVCTP/AVDTP/AVRCP/HFP LOS Greater than 15m Material:Metal color:red Interface details Power interface Universal Micro-USB 5V power supply 3.7-5V supply pad To achieve external 3.7-5V power supply modification U disk interface Support play U disk MP3 / WAV / APE / FLAC file, support FAT16 / 32 file format TF card interface Support play MP3 card in the MP3 / WAV / APE / FLAC file, support FAT16 / 32 file format LED indication Bluetooth mode blue light long, music mode blue light flashing 3.5mm stereo output Standard 3.5mm interface, the output stereo sound source, can be inserted headphones, connected amplifier and other equipment Key function definition button Features MODE "Short press", TF card, U disk, Bluetooth mode switch P / P "Short press" to play and pause the switch NEXT / V + "Short press" the next song, "long press" volume increase PREV / V- "Short press" on a song, "long press" volume down RPT "Short press", single / loop switch Package Contents: 1x Decoder Board Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Bluetooth mode blue light long, music mode blue light flashing. Support play MP3 card in the MP3 / WAV / APE / FLAC file, support FAT16 / 32 file format. "Short press", TF card, U disk, Bluetooth mode switch.