Crystal clear audio With the 10 mm dynamic driver in the compact Freebuds 4i you can enjoy a powerful bass experience. The highly sensitive Polymer membrane delivers powerful bass. Through the HUAWEI Audio Lab tuned, it delivers balanced bass, mids and treble as well as clear Voices, which corresponds to your pure and clear sound experience.Conversation, wind noise suppression The two microphones with "beamforming" technology can capture voice more direction and effectively separate the voice from the background noise The hydrodynamic windproof design eliminates howling caused by Air friction on the microphone and reduces the effects of Wind noise on calls. Attention mode Press and hold on the headphones to activate the attention mode to hear the ambient sound and communicate with others more comfortably to communicate without having to take the headphones out of your ears. Effective bandwidth frequency 20 Hz to 20 000 Hz