Feature:1. Supports Bluetooth 4.1, automatic back connection function.2. Support WAV+APE+FLAC+MP3 lossless decoding.3. On-board 3W stereo audio power amplifier.4. Support USB Audio Function, support memory card downloading.5. Support U disk and memory card playback, IR remote control function.Specification:Item Type: Bluetooth MP3 Decoding BoardPower Supply: 3.7-5VSNR: 90dBTHD+N: -70dBCrosstalk: -86dBDNR: 91dBSupport Profile: A2DP/AVCTP/AVDTP/AVRCP/HFPLOS: >15mRemote Control Battery: L1131C button cellBattery Capacity: 75mAhVoltage: 1.5VInterface Description: Micro USB Power Supply: Universal 5V Micro USB Power SupplyUSB Audio: Connect to the computer via USB cable, can use as external sound cardU Disk Interface: Support playing MP3/WAV/APE/FLAC files on U disk, support FAT16/32 file formatLED Indicator: Bluetooth mode blue light is on, music mode blue light is flashingTF Card Interface: Supports playing MP3/WAV/APE/FLAC files in memory card, supports FAT16/32 file formatIR Remote Control: Support infrared remote control operationAD Key Interface: Button interface, providing different resistance parameters to achieve different button functionsBluetooth Decoding IC: Decoder board master chip3.5mm Stereo Output: Standard 3.5mm interface, output stereo sound source, can be plugged into headphones, connected to power amplifier and other equipmentRight Channel 3W: Audio right channel output, can drive 3W speakersLeft Channel 3W: Audio left channel output, can drive 3W speakers3Wx2 Amplifier: Onboard 2 channel 3W stereo amplifier, can drive 3W speaker3.7-5V Power Supply Bonding Pad: Realize external 3.7-5V power supply refitOperation Instruction:1. Mode ControlWhen the decode board doesn't plug U-disk or memory card,power on defaults Bluetooth mode;when the decode board plugs U-disk or memory card,power on defaults music mode;using remote control MODE key or key to switch mode 2. Music ModePlug U-disk or memory card can play audio file which has been saved 3. Bluetooth ModeWhen switching mode,it broadcasts "The bluetooth device is ready to pair",representing that the board has entered into bluetooth mode and waiting for matching;cellphone bluetooth searching "XY_BT" (decode board device name),click the link,and the board prompts "The bluetooth device is connected successfully",representing that the decode board has connect with cellphone successfully and then play the music 4. USB AudioUSB Audio mode (also called sound card mode),use USB wire to connect with USB Audio interface,switch mode prompts "USB MODE" that is USB Audio mode.Open the music player on computer to play music,use decoder board to play music;if plug into memory card then it can be read 5. Notice: In USB Audio mode, please don't plug into U-disk Package List:1 x MP3 Decoding Board1 x Remote ControlNote:1. In the U disk playing mode, suggesting that use 5V power supply(no recommend 3.7V lithium battery), because earlier U disk cant support 3.7V power supply.2. When using power bank or PC USB port to supply, must use Power port on the board (mustnt use USB Audio port on board), or cant playing audio files stored in U disk.3. This decoding board only supports FAT16/FAT32 file system format, dont support NTFS file system format.