2017 new revision of the default stereo The above is a video demo Audio input mode: 1. Bluetooth receiver 2.USB decoding playback 3.TF card decoding playback Support for playback formats: MP3, WMA, WAV, FLAC, APE (APE only supports FAST encoding format) Power: 5VDC (original phone charger can supply a small USB plug) Pre output can be directly driven headphones, but also can be used after the power amplifier DIY Bluetooth wireless speaker accessories Cl