This is not only a stun gun, it is a multipurpose tool! First off, it is rechargeable, just charge it and it is ready to go. (Charger is included free of charge.) There are 4.5 million volts in this tiny device (4.75" x 2.5" x 1"). This is our most powerful product by far! There is an extremely bright LED flashlight, as well as emergency flashing lights. To make it the most advanced stun gun, it comes with an alarm which can be used when you feel in danger (110dB alarm). To top it off, it has a pin wrist strap to easily carry it to protect yourself.