http://www.nachi.org/forum/showthread.php?t=261&page=8
It is cool, but let me warn you… Do not give them to anyone as they have a tendency to catch fire after the 20 seconeds recomended.
Yep, they are very cool and pt on a nice display for your client and they are helpful, but ya gotta watch 'em. I had one begin to spark after 10 seconds. Good thing I had a spare!! Plus I still have my NACHI TRIBBLE.