GranVela A8 Dual Driver In-Ear Headphones [Dual Dynamic Driver-Perfect & All-range Performance] Unforgettable Experience 1. Dual 8mm + 6mm Drive High Fidelity Drivers for unique sound performance with well-balanced bass, mids and trebble. 2. An unforgettable experience created by high flexibility and exquisite high frequency, as well as easily-recognized medium frequency and steady bass. 3.Specially designed for those who enjoy both music and exercise, let A8 be your best sports companion with superb quality sound. [Fashionable and Noble] Transparent Blue, Simple and Cool Black, Transparent Three Colours provided-Transparent Blue is novel, fashionable and simple; cool black is low-profile and noble; while transparent is stylish but trendy. All possess unique features. Detachable Cable Wire Replaceable Extreme flexible tangle free TPE cable includes inline controller with universal microphone. Play/Pause your music or Answer/Hang up a call with a touch of a button right next to your hands. The feature depends on your device capability. A8 shall be your best music and business ear buds. [L-Shape Plug] Extending the Service Life of Cable The L-shape 3.5mm gold gilded plug can effectively reduce poor contact caused by the bending of cables, and it can extend the service life of cables at the same time. Ear Coupling : Intra Aural (Ear Canal Fit). Frequency Range : 20-22,000Hz. THD. Total Harmonic Distortion :