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The receiver - aliexpress.ru/item/1005001375...
If you have a pair of multimedia (PC) speakers, and want to listen to music from your phone or radio through them wirelessly, this device is what you need.
In this video, I unpacked, disassembled, connected and tested the Bluetooth / FM USB / SD card receiver / player JQ D079BT.
The receiver is assembled on a Zhongke Nanxun ab5325b chip (actually A3 JHEB14F5B UEM825 2030)
Bluetooth audio decoder board with shell WMA 12V MP3 Player Audio USB TF FM Radio Module Wireless Remote Control For Car