Navtool let's you connect a backup camera to your 730 or 430 stereo. I used it for 4 months, then decided to upgrade to an aftermarket stereo. It also let's you hook up a second camera, and an amplifier. Navtool is made in the US of A, not the other junk made in China that gives so much trouble. It retails for $400, asking $200 shipped to all continental US via Priority Mail.