Part of the Copenhagen 2 product line In-ear/earbud design provides a compact, comfortable fit Truly wireless design is powered by Bluetooth 5.4 technology for reliable connectivity 12mm drivers deliver enhanced audio clarity Three EQ presets (default for natural sound, bass boost for deep lows, and treble boost for clear highs) allow for a fully personalized listening experience Four microphones let you enjoy crystal clear calls Touch controls let you easily select settings Bluetooth multipoint connection allows you to smoothly connect and switch between two devices Enjoy up to 36 hours of total playback, with seven hours in the earbuds and an additional 29 hours from the charging case