A unique concept on Kickstarter is envisioned by its designers to be "the world's first smartphone defense case."

Inventors Seth Froom and Sean Simone have created “Yellow Jacket,” a special exterior for the iPhone that turns it into a mobile stun gun that can emit as much as 650K volts, enough to take down a potential attacker. Adding 3/8 of an inch and about 4 ounces in the iPhone's height and weight, respectively, the Yellow Jacket also doubles as an external battery that gives the iPhone an additional 20 hours of standby time

One major point of concern for the product is its safety, as the iPhone is foremost a smartphone and will be used in close proximity to the human face often. To keep the user free from any accidental shock, Froom and Simone have developed a safety switch and a rotating electrode cap to disable the shock electrodes and prevent accidental electrical discharge.

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