The Streetwise stun baton is a self defense device which disrupts the message the brain sends to the voluntary muscles. Simply touching an attacker with a stun baton for three to five seconds will deliver a high voltage shock causing loss of balance and muscle control, confusion, and disorientation bringing him to his knees and making him incapable of further aggressive activity. Full recovery takes about five to ten minutes and there is no permanent harm. Requires 4 SWCR123A 3 volt batteries (not included). Measures 18 in. long. Just test firing this unit into the air is often enough to stop an attacker. Includes a heavy duty holster with belt loop for easy carrying. Streetwise Stun batons are one of the highest quality brands available and come with a life time warranty.