JBL Wave 200TWS Headphones Black In-ear, Driver size (mm): 8, Driver sensitivity at 1kHz/1mW (dB): 108, Dynamic frequency response range (Hz):20 Hz – 20 kHz, Impedance (ohms): 16, Number of drivers per ear: 1, Bluetooth version: 5.0, Charging time (hours from empty): 2, Maximum play time (hours): 20h (5h + 15h)