Dune Road Design took an unusual route to solving one of the more common problems of mobile use on Monday through the Sinch. The superficially simple add-on uses magnets to latch on to the headphone jack and is designed to let listeners of smartphones wrap the cord naturally but keep it in place by folding it up. The design, from frog, is clever enough to let users get access to the earbuds with a tug and remove the entire wrapped cord just by pulling it off along with the headphone plug.