Grandtec Tun-5000 Airvision Atsc Dtv/Hdtv Receiver Tuner Auxilary Input For Factory Radios That Have Cd Changer &/Or Xm Controls Tunes & Decodes All 18 Approved Atsc Digital Television Formats (Sdtv & Hdtv) 480I, 480P, 720P & 1080I Selectable Outputs To Match Television'S Optimum Viewing Capability Output Can Be Configured For Either Widescreen 16:9 Or Standard 4:3 Televisions, Choosing From Letterbox, Zoom & Full-Screen Outputs Easy-To-Use Electronic Program Guide Displays Tv Programming Information