Mi True Wireless Earphones 2 Basic feature the MIUI Global user interface. When the charging case is opened, an interface for earphone connection pops up. After connecting, the earphones can be conveniently operated from your phone and you can view the battery levels of the earphones and the charging case. Each earphone is equipped with two built-in high-sensitivity microphones, which use beamforming technology to eliminate the background noise during calls, allowing the other user to hear you clearly, even in noisy environments.