Guard Dog Security’s OnGuard knife combines two of the most popular self-defense weapons, the knife and the stun gun, into one. Modeled to look like a real knife, the threatening appearance of the OnGuard alone may act as a deterrent. Additionally, the entire “blade” (unsharpened) of the knife is wrapped with a stunner that delivers a painful, non-lethal shock – preventing anyone from taking it away from you by grabbing it. The rubberized contoured grip makes it easy to hold, and the button located on the handle by the thumb makes it easy to deploy. Its built-in batteries are rechargeable with a USB input.