With the Pioneer DEH-S4000BT, you can say goodbye to audio cables. This car radio features a integrated Bluetooth function, enabling you to wirelessly stream music from a smartphone or tablet to the speakers. Connect 2 devices at the same time so you can quickly switch between multiple audio sources. In combination with the external microphone, you can make hands-free calls. If you want a powerful sound, then turn on the Dynamic Bass Enhancer. With this function, low tones in a song sound extra deep and steady, which is great for listening to rock or dance songs.