The Screaming Meanie is a battery-powered clock combined with an adjustable high-volume alarm. For lighter sleepers, set it at 70 decibels. That's comparable to a dog barking. To wake the dead, choose 120 decibels. That's like great seats at a Kiss concert.
The Screaming Meanie can also be a comfort when you're sleeping in an unfamiliar place. The alarm can scare away an intruder or be your call for help.
You can find Screaming Meanies in a variety of colors for about $35 at amazon.com and other online sources.