Power Remote on and off for Backup Camera Systems
More about this system
In the case of the solar panel it will allow the panel to recharge while the camera is off, then after it gets a charge switch the camera back on with the remote. In the case of the battery pack it will stop the camera from draining power from the battery.
What these remotes allow you to do is turn off the camera without having to climb up to the camera and manually disconnect it from the battery pack, solar panel, or 12V power source.