This compact stun gun is only about 5" long, but packs 150,000 volts of stopping power. Turn the switch to "on" and then press the trigger button. And best of all-no batteries to buy! Built in charger-just slide the prongs out and plug directly into a wall socket! Also has a built in flashlight with its own button. Comes with a handy carrying case-attaches to belt, purse strap, etc.