The Back-Up Camera is both dustproof and waterproof to IP67 standard, and features a wide-angle viewing lens that provides a 120-degree viewing area behind the vehicle.
As you'd come to expect on a Direct Connect device, it's also certified mil-spec 810G and IP67 and is water-resistant (it can be in one meter of water for up to 30 minutes).
The B15 is IP67 certified, which means both protected from dust and waterproof up to 3.3 feet for 30 minutes and can be dropped from about six feet and live to tell the tale -- you, however, may not.