Drive: 7mm Sensitivity: 92Db ± 3Db Impedance: 16? ± 15% Frequency Response: 20 ~ 20000Hz Plug Type: ?3.5mm Cord Length: 1.2m 1. 7mm Drive Unit: Provides you dynamic sound effect, the 7mm drive unit, ensures the high performance of this earphone.   2. Wooden Earphone: Excellent cuttings, the wooden earphone could prevent the diffusion of sound, and restore the pure music.   3. Ergonomic Design: In-ear headsets, soft earmuffs, more comfortable for long time wearing, would not feel any pain.   4. Anti-knot Cable: Selected high-quality materials, 99.99% pure copper wire, reduces the transmission loss and ensures the pure sound.   5. Built-in Microphone: High sensitive and clear microphone, provide you handsfree call, and you could control the call by the wired control.