The Tracks Single Earbud Headphones with Microphone are award-winning over-ear headphones with a subtle design, focused on clean lines and an iconic shape. Designed around an aluminum support that acts as a rail system for the sliding headphones. The customizable slider comes in 2 different colors and the 40mm speaker offers better frequency distribution and full-spectrum sound quality with impressive bass and detailed high-frequency notes. Component: Unit size 40 mm, Connector: 3.5 mm angled stereo, Speaker impedance: 32 Ohm, Speaker sensitivity: 112 +/- 3dB, Maximum input power: 70 mW, Frequency response: 20- 20KHz.