Much like the other cases, the SmartGuard case comes with its own disclaimers: It's a crime to use the spray for any purpose other than self-defense, and the FAA regulates the ability to carry the spray on airplanes (which, again, means you'll need to put the item in your checked baggage).
The case is from Piexon Self Defense Series and SabreRed; the websites include links to several FAQs and instructional videos. SmartGuard also has a free emergency app for iOS, but it isn't available to customers in the United States. The SmartGuard case costs $35 through Sabre's website and comes in black, white, or pink. I felt safe enough carrying it—although I usually carry pepper spray anyhow, it was nice having some so close at hand.
Stun gun: Yellow Jacket
Ah, the heavyweight. The Yellow Jacket is as serious as it gets, offering 650,000 volts that can either innocently charge your iPhone's battery or be purposefully discharged in defense of your person.
There are some obvious legalities and consequences involved in the use of this product: In addition to the multiple bright-yellow warning signs all over the packaging, the guides inside list extensive details as to how the case is to be assembled and used. The Support section of the website, in addition to providing training videos, lists states, cities, and counties where the case is illegal.
In addition to being very clear about what is and is not kosher with regard to operating this case, the Yellow Jacket comes with two safety precautions installed. To activate the stun gun, you must first flip down the cover of the prongs, then flip the switch and press the button to deploy.
The device then makes a loud electrical noise, and sometimes smells of ozone, and if you're like me, you manage to scare the dozen or so people in your immediate vicinity before realizing that an office is probably not the best place to be testing such a case.
The case itself is no joke. A big ol' slab of durable PC and ABS hard plastic with a hex-grip back and a two-piece assembly, the Yellow Jacket has LED indicators on the bottom, plus a switch that allows you to direct the stored power to your phone's battery instead of to the stun gun.
Cases for the iPhone 4/4s are $99, and available in black, pink, white, yellow, or red. The company says that versions for the iPhone 5 models and the Samsung Galaxy S4 will appear in "late fall 2013."
To assemble the product, you slide your phone into the case and onto the 30-pin connector in the bottom, and then you slide on the top portion of the case and lock it into place. This procedure sounds simple. In my tests it was not. It's a very tight fit along a specific angle, so you can easily overshoot it; the process always took me several tries.
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