Active Noise Cancelling to listen to your surroundings and filter out distracting noise, Driver size (mm):8, Driver sensitivity at 1kHz/1mW (dB): 100 dB SPL, Dynamic frequency response range (Hz):20 Hz – 20 kHz, Impedance (ohms):16, Number of Microphones: 4, Bluetooth version: 5.3, Charging case battery life (max hours): 30, Charging time (hours from empty): 2, Maximum music play time with ANC off (hours): 10, Maximum music play time with ANC on (hours): 8, Maximum play time (hours): 40, Speed Charging time (hours): 3, Maximum talk time (hours): 6