Specification. Data Transmission. USB-C. Frequency Response. 20Hz-20kHz. THD. THD<0.5% 1kHz. Headset Output Power. 35mW, 32Ω (1KHD+N=1%). Sample Rate. 48kHz/16bit. Wireless Connection. Bluetooth 4.2. Battery Type. Li-Polymer. Battery Capacity. 1200mAh. Charge Parameter. 5V/1A. Charge Time. Appr. 3h. Battery Life. Appr. 8h (Highest keypads brightness). Dimension. L24*W14*H4.2CM(button included)