The Blazer wireless lights use 4 AA rechargables each. I picked up a charger and batteries at Walmart on sale.
There is a wire connecting the two lights but it is not a problem. I my case it is inside on the back window deck when I am using the lights so no paint damage.
The transmitter plugs into the MH trailer light recepticle (4 pin) and the magnetic transmitter attaches to the top of the hitch frame, right beside where it plugs in. I put it on top of the hitch frame to make sure it will not slide down on rough roads.
So far so good but my trips have been limited since getting the lights.
The big advantage for me is that I did not need to add any after market electrical components to an already complicated set of LED tail-lights. I don't have to pull fuses or add a fuse by-pass or any device to prevent brake light over-ride.
These wireless lights work very well for me, easy hook-up, no wires to run, easy take apart and they are not committed to any one vehicle. Plug and play.
I don't find it takes a big effort to remove the AA batteries from the lights, place them in a charger and forget about them till the next time I move the rig. I estimate maybe ten minutes of my time and time is the one thing I have for free.