This pair of EarFun Air True Wireless BT 5 Earbuds is your perfect companion for your daily commute, workout, music streaming or answering calls. It features custom-built composite cellulose drivers for superior sound and enhanced 4-microphone call technology, which filters out disruptive noise around you. EarFun Air offers an excellent experience for your calling with more transparent voice quality, and you can take calls using either, or both, of the earbuds. This pair provides seamless fit and SweatShield™ Technology so you can use it perfectly even doing strenuous activities. With the combined battery life of these earbuds and charging case, you'll get up to 35 hours of crystal clear audio.