ITEM NAME:Bluetooth Audio Receiver Board w/USB TF Card Slot DIY Modified MP3 Module Product Description Description: Function: This module supports Bluetooth 4.1. It supports automatic link back function, WAV+APE+FLAC+MP3 lossless decoding, stereo output, and TF slot. It can insert TF card, support U disk and play TF card. Specification: Power Supply Interface: Universal Micro USB 5V Power Supply Power supply pad: external 3.7V-5V power supply modification USB (U disk) interface: can support playing MP3, WAV, APE, FLAC files in U disk, support FAT16/32 file format TF card slot: can support playing MP3, WAV, APE, FLAC files in TF card, support FAT16/32 file format LED Indicator: Bluetooth mode lamp is always on, music playing mode lamp is flickering 3.5mm Stereo Output: Standard 3.5mm Interface, Stereo Source Input, Headset Insertion, Power Amplifier Device Connection Product size: 45mm*40mm*8mm/1.77*1.57*0.31'' Packing weight: 12g Button Description: MODE: "Short Press" can switch TF card, U disk and Bluetooth mode. P/P: "Short Press", Play/pause NEXT/V+: "Short Press" is the next song, and "Short Press" is the volume increase. PREV/V+: "Short Press" is the last song, and "Long Press" is the volume reduction. RPT: Short Press for Mono/Loop Switching Operation Manual: 1. Mode control: When the decoder board has no U disk or TF card, the default mode is Bluetooth when the module is.This module supports Bluetooth 4.1. It supports automatic link back function, WAV+APE+FLAC+MP3 lossless decoding, stereo output, and TF slot. It can insert TF card, support U disk and play TF card.