If you are looking for an inexpensive self-defence device the Walla Walla Stinger just might be the perfect fit. Master of Arms, James A. Keating has designed a perfect key chain tool.
The Walla Walla Stinger fits on your key chain and is always available when you need it. It is designed to focus the power of a punch into a very small area giving even a small person devestating power. I recomend these to both men and women who I teach in Self Protection Clinics.
To be a good self defense tool something needs to be simple, reliable, and effective. The Walla Walla Stinger fills all of those requirments. They sell for less than $15 and will last for years. James Keating has them on sale now.