If your looking for some real punch in a very small package then the Fang Keychain Stun Gun is it. While less than 3" long and only weighing 2oz the Fang stun gun produces 60,000,000 volts with 4.8mA for some serious punch. It's small size is great for putting on keychains or just carry in your pocket, and it has a safety switch to prevent accidentally shocking yourself.
There's also a green LED light for reassurance when the safety is on. Then when you're ready to act, slide the safety ON/OFF switch to 'On'; the LED light will turn red, and you're set for protection. The Fang stun gun also comes with a 100-Lumen Flashlight that you could use to temporarily blind an attacker or just use to help see your way in the dark.
The stun gun is also rechargeable and has a battery life LED indicator so you know when it's time to recharge. Just plug in the included micro-USB charging cable and connect it to any power source. Available in 3 colors: Black, Pink, Purple
Specifications:
Here is a link to further information regarding Stun Gun Laws.
