13mm dynamic speakers with ENC noise cancellation for clearer calls: larger drivers for high-fidelity stereo sound with crisp, clear highs and deep, rich bass. 3g single earbud, pocket design charging case with LED battery indicator and up to 40 hours of playback time: LED display shows the remaining battery level of each headset and charging case in real time. BLUETOOTH 5.3 FOR EASY, HIGH-SPEED AUTOMATIC CONNECTION WITH iOS OR ANTARTHROID DEVICES: With improved Bluetooth technology, our noise-cancelling earbuds transmit your device's signal quickly and consistently, with no delays or degradation of quality during music playback and calls. EASY TOUCH CONTROL, MULTIPLE MODES: Each earbud has a built-in sensitive touch control key, you can directly touch it to manage music or calls, adjust volume, answer/end calls, enable voice assistant....All operations are at your fingertips, no need to take out your mobile phone.