The kit is made by dave G who has been making and building NV kits and torches for at least the last eight years , he is a very well respected member on the NV forum
The kit is actually called a kwik fit add - on ,the tube houses the camera and fits on the ocular end of the scope and comes with three shims to add diameter to the ocular end so as to get a good fit to any scope when the tube is tightened by thumb screw, it has one wire with quick release plug that plugs into the screen housing that also has the IR torch machined and fitted into it
The IR has a three mode pill in it ( low, medium and high ) and is operated by one of two silent switches on the bottom of the housing , press once for low , twice for med and three times for high
The beam of the torch goes from flood to spot by turning the torch head and the screen/ torch housing is fitted to the scope by a quick release clamp , the unit runs on three 18650 batteries and can be put on/ taken off in about 30 seconds
Hope that helps ,if any more info needed dave has videos on you tube showing the unit being put on and in action , these are not cheap home builds but quality machined units which put the likes of nitesite to shame
Can e- mail more pics of unit on and off gun if required.
Cheers