JBL Vibe 200TWS Headphones White 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): 5