Features 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 Board Power Supply: 3.7-5V SNR: 90dB THD+N: -70dB Crosstalk: -86dB DNR: 91dB Support Profile: A2DP/AVCTP/AVDTP/AVRCP/HFP LOS: >15m Remote Control Battery: L1131C button cell Battery Capacity: 75mAh Voltage: 1.5V Interface Description: Micro USB Power Supply: Universal 5V Micro USB Power Supply USB Audio: Connect to the computer via USB cable, can use as external sound card U Disk Interface: Support playing MP3/WAV/APE/FLAC files on U disk, support FAT16/32 file format LED Indicator: Bluetooth mode blue light is on, music mode blue light is flashing TF Card Interface: Supports playing MP3/WAV/APE/FLAC files in memory card, supports FAT16/32 file format IR Remote Control: Support infrared remote control operation AD Key Interface: Button interface, providing different resistance parameters to achieve different button functions Bluetooth Decoding IC: Decoder board master chip 3.5mm Stereo Output: Standard 3.5mm interface, output stereo sound source, can be plugged into headphones, connected to power amplifier and other equipment Right Channel 3W: Audio right channel output, can drive 3W speakers Left Channel 3W: Audio left channel output, can drive 3W speakers 3Wx2 Amplifier: Onboard 2 channel 3W stereo amplifier, can drive 3W speaker 3.7-5V Power Supply Bonding Pad: Realize external 3.7-5V power supply refit Operation Instruction: 1. Mode Control When 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 Mode Plug U-disk or memory card can play audio file which has been saved 3. Bluetooth Mode When 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 Audio USB 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 Board 1 x Remote Control