The product has been upgraded and the FM radio function has been added. This model does not have a remote control, as shown below: Audio source input method: 1. Bluetooth receiving 2. USB decoding playback 3. TF card decoding playbackSupport playback format: MP3, WMA, WAV, FLACPower supply: 5V DC (original mobile phone charger can supply a small USB plug)The front stage output can directly push the headphones, or it can be connected to the rear stage amplifier