The amplifier has 3 input options for playback of various devices. An MP3 connection. A REC socket. Auna HiFi stereo power amplifier AV2CD508 steel 600WDie sound reproduction is very good and you have various possibilities for intervention + or -. However, I miss an output for headphones. Other manufacturers have equipped their devices with it. It is a good and solid device for daily use. The delivery has worked flawlessly.