The GameDr Video Game Timer is designed to force kids to only play video games for a specific period of time each day. It's for lazy parents who don't want to tell their kids to shut the consoles down themselves, apparently, as it simply cuts the power to the console when the timer is up.
Now I've got to feel for the kids who have to put up with this. When mom peeks her head in and says wrap it up, you at least have a chance to finish the level and save your game. But this thing is cold; it'll cut you off even if you need but 10 seconds more to finish a save. Just parent in person. It's cheaper.