I was of reading one the thread in our forum, I came across a feature in a lexes SUV. Each passenger can control the visibly of the window tint. I stunned by the feather and did a Google. And discovery the name in many form.
Switchable glass or electric tint or Electrochromic film or Variable tint or PDLC film or smart window.
Just in case if you are wondering what I am talking about try google "smart glass" you would end of with a lot links with image and video.
In a nutshell, its film like a sunfilm which is pasted on glass. By default it looks blur. When you pass a small voltage the film becomes transparent. At a click of a button you can control a privacy. (off course you get a cheap sunshade to stick on to the windows)
I was wondering, is there any one in India tried this ? are they available in India?