The ScopeOut system's specially-designed mirrors mount in the rear passenger area of your car. Just look into the vehicle's rear-view mirror and let the ScopeOut mirrors give you a more complete view of what's behind your vehicle. Your blind spots will shrink, and you'll enjoy a clear and expansive view when you're changing lanes or backing out of parking spaces. The interior-mounted Car Model is a single unit that mounts inside the back window using 3M acrylic tape. The sleek housing will not interfere with window tinting or vehicle defroster wires.