Upgraded BT5.1 chip, more stable and faster connection, stronger anti-interference ability, low delay Adopt 13mm dynamic driver and noise isolation in-ear design, you will listen to music with rich highs, crisp mids and clear, balanced bass The LED display screen shows the battery power of the charging case in real time, no need to worry about power shortage ENC environmental noise reduction technology provides clear calls The E3102 is designed to give you the freedom to switch between single-ear and double-ear seamlessly