This switching box is designed so that 2 reversing camera feeds can feed in to 1 cable / input. The connections are all the common 4 pin screw aviation type.
We brought these in for people that wanted to install one of our popular twin lens reversing/driving cameras, but only had a single existing 4 pin cable.
This box has a blue trigger wire that should be connected to the reverse light feed, so that box switches input when the vehicle goes in to reverse.
We have modified these boxes so that the power for the box comes from the 4 pin output ie usually a monitor etc.
Please note that the box is not waterproof and should be mounted in a dry area.