The HA-S650 is a flat-folding model so it?s easy to pack, and light weight so it's comfortable during extended use. The slim design does not compromise on sound quality, with a 1.42-inch (36mm) driver unit providing deep bass and the 3.94-foot (1.2 meter) pure copper cord minimizing friction noise. It?s outfitted with a slim, gold-plated iPhone-compatible plug.