Rockbuds by Chicbuds RBRB RockBuds Inner Earbuds (RockBand) Built-in retractable device allows the cord length to expand and retract to 5 lengths from 4 inches to 48 inches Perfect for any body type or activity Clip prevents cords from bouncing around and the compact retractable device keeps cords from tangling when not in use Compatible with iPod, iPhone, MP3 players, computers, stereos, CD players, DVD players, game players, airplane connector, gym equipment and more 3.5 mm jack