Features: BT 5.1 brings high data transfer speed, stable connection and low power consumption. Automatically pair after taken out from the charging case. Designed with USB output port, the 1200mAh charging case can be served as a power bank, convenient to charge your mobile phone at any time. Built-in high-definition microphone, CVC8.0 intelligent noise reduction, delivers clearer and more real talking sound in stereo mode. Multi-functional touch control, support switch songs, phone call, volume control and wake up voice assistant. Intelligent power display, let you know know the remaining power of charging case, left and right earphones in real time.