This product is an independent Bluetooth module as shown in the main picture, and does not come with other peripheral accessories. KCX_BT003 is a multi-purpose Bluetooth audio decoder board that integrates Bluetooth audio, Bluetooth calling, and MP3 decoding. In Bluetooth mode, it supports matching various smart phone players on the market to play music, and supports voice reporting of incoming calls, answering calls / hanging up calls / redialing recent calls, Bluetooth background connection and other functions. In music mode, it not only supports the commonly used MP3 format audio, but also supports decoding of high-quality audio formats such as WMA, WAV, FLAC, etc. Just by implanting this decoder board into your design, you can upgrade ordinary wired audio products to wireless Bluetooth audio products. typical application   ● Home bluetooth speakers   ● Speaker repair   ● Car player modification   ● Computer speaker upgrade   ● Bluetooth MP3 decoder Features and Advantages   (1): Excellent durability and coexistence   (2): Ensure the stability of Bluetooth transmission through a variety of technologies   (3): Intuitive LED indication   (4): Voice prompt   (5): Convenient and easy to use   (6): Wireless transmission distance ≥ 10 meters   (7): Adopt the latest Bluetooth 5.0 protocol, backward compatible with other versions of Bluetooth protocols Function description   (1): With USB sound card playback function (USB connected to the computer to enter the USB sound card mode, after inserting priority, not plugged into this mode. When the USB is connected to the computer, the boot must enter the USB AUDIO mode first).   (2): With Bluetooth audio playback function, Bluetooth call function, incoming call voice number reporting function, Bluetooth background function (in other modes, the phone should be able to automatically enter the call mode to report voice, and hang up after the call to return to the mode before the incoming call) (device name: Bluetooth Audio)   (3): With U-disk playback function (with U-disk inserted into U-disk playback mode, rear-insertion priority, no U-disk online skip this mode)   (4): With TF card playback function (TF card is inserted into the TF card mode, the rear insert is preferred, and there is no TF card online to skip this mode)   (6): With Chinese (English) voice prompt function (you can choose to buy Chinese version voice and English version voice) The priority of each mode is from high to low: USB sound card => Bluetooth => U disk => TF card (USB sound card, U disk, TF card, when it is detected that it is offline, press the mode key to automatically skip the corresponding mode)   (7): Music mode supports decoding formats: MP3, WMA, WAV, FLAC.   (8): Support track breakpoints, volume power-down save.