The remote control unit that operates your TV, Sky box, Satellite set top box, DVD and so on, does so by sending infra red waves. The problem is that infra red waves require "line of sight" to function - that is, uninterrupted visual contact.
This is why you can't change the channel on your Sky box from the bedroom (unless your Sky box happens to be there with you). And why the remote doesn't work if the dog's in the way.
The 'XRay' Remote Control Extender converts the infra red waves from your remote to radio waves which can travel through walls or floors (or dogs) up to 100ft away from your Sky box. It's different from every other remote extender because it fits inside your remote control.
Now you can watch Sky in bed, control your HiFi from the outside deck or hide your AV equipment in a cupboard. Clever!