Feature:Mode:Bluetooth mode,Music modeSupport for Bluetooth 4.1, support automatic return function, support WAV + APE + FLAC + MP3 lossless decoding, stereo output, comes with TF card download, support U disk, TF card player. Parameter characteristics:Power Supply:3.7-5VSNR:90dBTHD+N:-70dBCrosstalk:-86dBDNR:91dBSupport Profile:A2DP/AVCTP/AVDTP/AVRCP/HFPLOS:>15mInterface specification:Power interface:Universal Micro USB 5V power supply3.7-5V supply pad:3.7-5V power supply modificationU disk interface:Support play U disk MP3 / WAV / APE / FLAC file, support FAT16 / 32 file formatTF card interface:Support play MP3 card in the MP3 / WAV / APE / FLAC file, support FAT16 / 32 file formatLED indication:Bluetooth mode blue light long, music mode blue light flashing3.5mm stereo output:Standard 3.5mm interface, the output stereo sound source, can be inserted headphones, connected amplifier and other equipmentKey function definition：MODE:“click it once “，TF card, U disk, Bluetooth mode switchP/P:“click it once “，Play and pause the switch NEXT/V+:“click it once “The next song，”Keep pressing “The volume increasesPREV/V-:“click it once “On a song，”Keep pressing “Volume downRPT :“click it once “，Single / loop switch Precautions:1, if the U disk to play, it is recommended to use USB 5V power supply (not recommended to use 3.7V lithium battery), because the early U disk does not support 3.7V voltage.2, U disk or TF card, decoder board only supports FAT16 / FAT32 file system, does not support NTFS system.Package Included:1 x Bluetooth Decoding BoardNO Retail Box. Packed Safely in Bubble Bag.