The AKG K 317 in-ear bud headphones deliver true AKG performance - high-output sound and excellent frequency response - from virtually any portable device, including iPhone. Using a Super Bass circuit, they deliver a richer, more dynamic listening experience from any portable device making them the perfect upgrade. The amazing thing is their size. They do all of this in a lanyard type design that is no bigger or heavier than conventional ear buds. Add a sculpted, modern design and a lightweight, comfortable fit and they are they are the perfect companion for everyday use. A protective soft carrying case and a winder for the headphone is even included to keep your headphones safe and secure when not in use.