I renounce gladly on the technical intricacies, since these have already been described here. Use the device now since about 4 weeks and am very satisfied. Easy to use, all important functions can be accessed immediately. A special plus: the display can be dimmed, which is very pleasant when driving at night. For this purpose a great reception in conjunction with the "4403.80 Magnetic Antenna" of antenna technology Bad Blankenburg. The FM transmitter is powerful in word programs no noise or "Wabbern" in the background. Full buy recommendation!