Wired ES-500i headphones from Awei with excellent sound quality and the ability to answer your calls or change your music with the press of a button. They are lightweight for comfortable, long-term use and have an ergonomic design that fits perfectly in the ear for excellent sound insulation. Features: Microphone, Plug: Jack 3.5mm, Speaker diameter: 10mm, Sensitivity: 91dB ± 3dB, Impedance: 16ohms ± 15%, Frequency: 20-20,000Hz, Cable length: 1.2m. Packaging dimensions: 15.5 x 8.6 x 2.7 cm.