The af33 will play its heart out every time and astonish you with its sound quality, noise isolating in-ear design, light-weight, excellent sound and great value. Ideal for: • the casual listener who wants to answer calls on their phone • sports and exercise tech specs: driver type: 9mm dynamic driver; magnet type: neodymium; frequency range: 20-20khz; sensitivity: 116db at 1 khz; impedance: 16; cable length: 1.2m / 47”; plug type: 3.5mm gold plated;