My dog would probably destroy this in about 10 seconds but this is one cool high-tech dog collar. It’s made of keyboard keys, each has a small LED light drilled into it. The cool part is that the keys actually spell out the dog’s name! Of course this dog collar won’t work at all if you give a long name to a small dog or a short name to big necked dog. The lights are powered by a 9V battery in an Altoids tin. Complete how-to available at Instructables if you’re handier than I am, but I’m certainly not comfortable enough with electricity to put a homemade battery powered appliance around my dog’s neck.