Thunder Blast Tactical Pen is 6 1/2" overall in length and delivers maximum performance. This item is for personal use and self defense protection only. Its high power voltage stun gun is very powerful and comes with its own micro USB charger and black carrying sheath. This item is NOT a weapon and is intended for SELF Defense USE ONLY. This is a light weight item and designed to look like a pen so its discreet for every day carrying and protection. While holding the stun gun against the body, you will not see or hear the spark. You can continue to fire as long as necessary without damage to the unit as would occur if testing in dry air. A shock from a stun gun lasting one second or less will cause pain and minor muscle contractions. Stunning the assailant for one to two seconds is sure to cause muscle spasms and a dazed mental stage. Stunning the assailant for three to five seconds will cause loss of balance and muscle control. To avoid accidental discharge, always move the on/off switch to the off position when not in use. The most effective stun locations are the shoulder, hip, thigh, buttocks and below the rib cage. Should be used in a dangerous situation For Self Defense and Personal Protection only. This is the perfect gift for your family members, friends, and co-workers. Even though this is not a weapon you must be at least 18 years of age or older to purchase.