5 neat gadgets that use your smartphone's headphone jack to pull off cool stuff

Of course, this could change if Apple really goes through with its intention of removing the 3.5mm jack from the next iPhone. But for the time being, headphone jacks thrive, and so do clever gadget makers with ideas and time on their hands. Check out these five neat accessories that will make it possible for your phone to do stuff you may not have thought of!