Check the listing for details. 3.7-5V Bluetooth 4.1 Audio Decoder MP3 Player Board Micro USB TF SD Card Module. Condition: New. Listed at 2.83 USD. 3.7-5V Bluetooth 4.1 Audio Decoder MP3 Player Board Micro USB TF SD Card ModuleProduct Image: Product Description: Description: Support 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: Power Supply: 3.7-5VSNR: 90dBTHD+N: -70dBCrosstalk: -86dBDNR: 91dBSupport Profile: A2DP/AVCTP/AVDTP/AVRCP/HFPLOS: >15m Interface 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 equipment.Key&Function: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 switchInstructions:1.mode controlWhen the decoder board is not inserted U disk or TF card, boot the default is Bluetooth mode; when the decoder board plug U disk or TF card, boot the default music mode; MODE key to switch mode.2.music modeInsert the U disk or TF card to play the stored audio files.3.Bluetooth modeSwitch the mode broadcast English "The bluetooth device is ready to pair", that enter the Bluetooth mode and wait for the pair; mobile phone Bluetooth search to the "XY_BT" is the decoder board device name, click on the link, the decoder board prompt "The bluetooth device is connected successfully", Indicating that the decoder board and mobile phone connection is successful, you can play music. As shown below: 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 include: 1pcs NEW 3.7-5V Bluetooth 4.1 MP3 Player Lossless Decoder Board Micro USB TF SD CardFeedbackWarrantyShipmentFeedbackWe appreciate your feedback very much. As it will motivate us do better. If you have any questions with our goods or service, Please kindly contact us firstly before leaving negative feedback. Thank you in advance Warranty1. All merchandise will be carefully test before shipping. We will try our best to avoid any quality problem. 2. We promise warranty for quality in one year and we will repair it free of charge. The returning shipping should be paid by customer. 3. If you are not satisfied with the product, Please contact us. We'll provide you a satisfying solution.Shipment1.Normmly we will send the goods within 1-3 working days after your payment is verified . 2.Please check if the goods are in good condition and sign before the delivery man leaves.If you find the product is lost or damaged on the way. Please take photo and let the delivery men confirm it. Then we will help you let the shipping company compensate you.On Aug 4, 2023 at 21:25:21 PDT, seller added the following information: