Need a digital player that supports WIFI or Bluetooth, there are already many similar players on the market. Through WIFI, you can not only transmit the audio in the mobile phone to the sound system, but also transmit the pictures and video data in the mobile phone to the TV. The mobile phone can also be used as a remote control to control the digital player or NAS through wifi. Retrieve a high-fidelity audio or video file from the NAS and play it back in a digital player.