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A small bare circuit board that adds Bluetooth 4.1 audio, USB stick playback and microSD card playback to a car stereo, amplifier or powered speaker. It has three inputs, five EQ presets and on-board buttons for track skip, volume and mode. It is a DIY part, not a finished device: it needs a 5V DC supply and you wire its audio output to your own amp. Compared with ready-made Bluetooth receivers it is far cheaper and more flexible, but it has no case, no display and no aptX, and the EQ only works in USB and card modes.
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This is a Bluetooth 4.1 audio receiver and amplifier module for adding wireless audio to electronic projects. It can be used in products such as cars, amplifiers and home stereos. It has three audio input modes: Bluetooth reception, USB decoding playback and T-F card decoding playback.
It plays MP3, WMA, WAV, FLAC and APE files (APE in FAST encoding only). Five sound effects are available: Class, Jazz, Rock, Bass and Normal. The EQ button switches them, and it works only in USB or T-F card playback mode.
The MODE button switches between Bluetooth, USB and T-F card modes. A short press of NEXT plays the next song, and a long press raises the volume. A short press of BACK plays the previous song, and a long press lowers the volume.