Concerning this item QUALITY CALLS & ALL-DAY BATTERY: Your earbuds can last the entire day on a single charge thanks to their 27-hour battery life. Additionally, to save battery life, four microphones with a noise reduction algorithm are built with a Mono Mode that allows you to listen through one or both earbuds. BLUETOOTH CONNECTION: Bluetooth 5.2 enables quick connections to compatible devices up to 30 feet away, and multipoint technology enables seamless switching between two devices simultaneously. SIGNATURE SOUND: With their 12mm drivers, these earbuds produce enthralling sound that transforms every listening session into a private concert. Three equalizer presets are included, which improve common sounds from podcasts, music, and other sources. NOISE CANCELLING: Take advantage of hybrid environmental noise cancellation (ENC) for all-day comfort.