There are several different types of reversing camera depending on the application.
In addition to the actually reversing camera system, audio intercoms are used to communicate with spotters for reversing large trailers.
Reversing in the dark requires night vision cameras when reversing lights are too weak.
For smaller vehicles, portable cameras are easily set up and dismantled.
Specialised cameras can replace brake lights with a combination of devices which both contains the reversing camera and illuminate.