Fitting an interior mirror-monitor takes the strain out of reversing.
They are discreet and are also in the natural line of sight between each of the door mirrors.
When you select reverse gear, part of the screen switches on to show what the reversing camera can see.
When not in reverse, it looks like a normal tinted mirror, so your vehicle looks factory standard.
There are 2 types; 'replacement' - if your vehicle has a compatible wndscreen mounting as shown, or 'clip-on' - which simply clips over your existing mirror.