Bluetooth hands calling and external touch key control for easy operation. Automatic source switching among USB, TF card, Bluetooth, FM, and AUX. Includes tips and conversion to cable (signal sound or voice in English optional). Remotecontrol based folder playback. Easily browse and play different music folders or categories on USB drives or TF cards. Supports MP3, WMA, and WAV formats. MP3 32320 kbps; WAV and WMA up to 1411 kbps or less. Use scenarios In a car: pair with your phone for hands calls via Bluetooth, while music can come from USB or TF. The device automatically switches between sources and you can browse music folders with the remote. At home or in the office: connect via AUX or Bluetooth to a speaker system and play MP3/WAV/WMA files stored on USB or TF memory cards; navigate folders remotely for convenient playback. On the go: load playlists on a USB drive or TF card and use FM mode to listen on a nearby car radio or portable speaker, with easy control through the remote.