The secret behind the TEK-12′s power is its Lithium-Ion battery which is able to retain over 95%+ of its power even when the battery has 10% or less of battery life left. Traditional stun guns contain nickel cadmium batteries which not only take longer to charge, but as the battery life goes down, so does the power. These type of features are ONLY found within ShockTEK Defense products. The additional power from the TEK-12 will not cause any permanent damage to the assailant. Our technology has allowed us to provide our customers with not only a reliable product, but a safe one. After all, the reason for owning a stun gun in the first place is to make sure you are always protected and safe! The TEK-12 flashlight stun gun also features an EXTREMELY bright LED flashlight and a nylon case/holster for your convenience. The TEK-12 also features DUAL safety switches to prevent accidental mis-firing. ShockTEK Defense stands behind every product they sell with a FULL 90-Day warranty. We also offer Standard, Expedited, 2-Day & 1 Day shipping options.. REMEMBER, SAFETY DOESN’T HAPPEN BY ACCIDENT..