KON-F-28 is an aftermarket audio system manufactured by the German company, Carmedia. It is an all-in-one head unit that features a 7 inch touchscreen touchscreen display and 2DIN, double-DIN size housing with a single-DIN chassis. The system offers a wide range of features, including a built-in FM/AM radio, CD/DVD player, MP3/WMA player, USB port, and rear-view camera support. It also supports Bluetooth for hands-free calling and audio streaming, and offers AUX input jack for connection to external audio sources. Additionally, the system offers built-in GPS (Global Positioning System) and navigation.