Their web site is
www.littman45single.com
I have had one for about a year but have not used it as much as I would like. It is a very well made conversion of a polaroid camera that allows you to use a handheld 4x5 as a rangefinder.
It is fairly light and well built and relatively easy to focus like a smaller rangefinder. They come with a couple of lens options like a 127 and a 150. I have the 150. You cannot change lenses. You can also order the ground glass option and use it like an ordinary 4x5.
I use it with grafmatic backs that allow 6 shots, so what you have is a 6 shot 4x5 portable camera that is easy and fun to use.
It is quite expensive $2500 - 3500 rannge depending on what you order.
It has it detractors who don't like the designer or the price. There are many who say it is better to have a portable linhof or a press camera with interchangeable lenses, but there is really nothing like it on the market and if you can afford it, its a great camera.
I will add that William Littman is a nice man and cares about his customers and will take all the time you need to discuss the camera with you if you contact him. His detractors may disagree but so be it.
There is a new version coming out as well.
Michael