Play an excellent balance of mid-high range and low range so you can enjoy the music in a refreshing feeling, high-quality sound fresh.n18-22,000 Hz frequency band playing. 200mW maximum inputnImpedance 16Ω. Output sound pressure level 100dB/mWnDriver φ13.5mm. Weight 5gnSmall lightweight body that fits snuggly into the ear with ■ a new design drivers enjoy the high-quality sound and clear. The diameter of the inner-ear headphones is usually about 17 ~ 18mm, but the operation of music and video and a call on your smartphone design ■ microphone built-in controller that the image of a glass pour the realization ■ sound smallish size and about 15.8mm in this product (in some smartphones, there is the operation of music, the animation play / pause can not be) you can squeeze the volume a (power supply-free that can be volume control at hand ■. not become mute, even to the minimum possible with) volume