I agree with hscoach.
I bought a pair of them for my nephew who has been wanting to learn, but is a bit young for a steel weapon (so says his mom, at least

)
They basically have a button on the end, covered with a rubber cover, which sounds off, not so much a buzzer, but a high ear piercing squeal. They held up fairly decent, even if sometimes the rubber covering gets the button stuck either on or off. hehe.
The battery's the oddest thing I've ever seen though. It's a 12 volt battery that's the size of a double A. I have never seen one of those before... and even though 12 volts should last a very long time with just buzzing every once in a while, I wonder where I can buy replacements. Of course, by then, my nephew should be "old enough" for steel blades.
