With the Pioneer DEH-S100UB you can listen to the radio or play music from a smartphone, usb stick, mp3 player or CD. The car radio plays flac audio files from a usb stick. Flac audio files are the least compressed, so there is no loss of quality. This allows you to hear every detail when you listen to your favorite music. With this car radio you can play MP3 CDs that fit tracks on a regular CD. You connect an audio device, such as an MP3 player, via an aux cable to the radio via the aux input. Have you arrived at your destination? Then take the removable front panel with you. This way you prevent the radio from being stolen. You control the car radio with your smartphone when you download the Pioneer app. In this way you use your phone as a remote control.