The creators of Yellow Jacket, a unique combination of smartphone case and stun gun, think this product could be the answer to New York Citys most frequent crime: iPhone theft. Legalize our device and [it] would stop overnight, says co-founder and CEO Sean Simone. The Yellow Jacket is a pretty basic rubber iPhone case that snaps on to a larger attachment; After that, the Yellow Jacket can be used to double the battery life of an iPhone or zap a wannabe mugger about 50 times.