Retractable headphones up to 3 feet for phone, or MP3 player. Cord mounted ON/OFF button which lets you take calls and hang up easily. Excellent sound quality and super clear sound with no long dangling wires to get all tangled up with. The powerful magnetic button allows you to clip the headphone anywhere without the need for a pin, clip or other securing device. Will not ruin your clothes, leave holes or crease materials. Plug: 3.5mm stereo mini plug. Works for all Blackberry, Ipod, Iphone, airline jacks.