I love those things. I've got a few that I use in my place. They used to only be available around Christmas, presumably for turning lights on and off in places where there usually aren't any lights -- outdoors along the eaves, for instance.

One thing, though -- those will still take some doing. You can't just plug the screen into the switch. Screens require a constant hot to power the screen when it's going down and when it's going up, with the trigger being on to lower the screen and off to raise it. With one of these you'll still have to get a 12 volt or similar supply to present the actual trigger voltage.