AKG K 321 In-Canal Bud Headphone - Cloud White (Discontinued by Manufacturer) Lightweight, in-canal design naturally blocks out ambient noise while remaining comfortable for everyday use. iPhone compatability allows use with an iPhone without the need for an extra adapter. Wide dynamic range and exceptional bass response makes them the perfect upgrade for virtually any portable device S, M and L silicon sleeves allow the K321 headphones to fadapt to fit snuggly in nearly any sized ear. Included carrying pouch helps keep your headphones safe and secure when not in use.