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 2.57 USD. 3.7-5V Bluetooth 4.1 Audio Decoder MP3 Player Board Micro USB TF SD Card ModuleDescription: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 CardPaymentShippingRefundPayment EBAY Managed Payment. But we only Accept your Ebay Address, please Make sure it's 100% right. Payment must be received in 5 business days of auction closing. Please leave note for your special request (e.g. Colors or Size) in PayPal when you pay the order. Any special request cannot be accepted after 24 hours of payment, because most of orders will be processed instantly and same day dispatched.Shipping 1. We only ship to the confirmed address provided by eBay. please make sure your ebay address is 100% matches the address you would like us to ship to. If not, please let us know before we sent you the package, or we will not be responsible for any loss. hope you could understand. 2. Orders will be processed instantly and dispatched within 1-3 business days except hoilday, so we do NOT accept any email/message note after you place orders. 3. All package need to wait 30 days,Please take care it.Less than 30 days,we can't take a refund.Refund If you can't receive the product within 2 months (60 days), please contact with us,we promise to payback 100% of your money. We ensure our products work normally before post.If the products is broken before arrival to you,all you should do is taking a photo to show us our broken product.We promise to payback 100% of your money. If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it. If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item.