SPECIFICATIONS. Data Transmission. USB-C. Frequency Response. 20Hz-20kHz. THD. THD<0.05% 1kHz. Headset Output Power. 20mW, 32Ω (1kHz, THD+N=1%). Sample Rate. 48kHz /16bit. Wireless Connection. Bluetooth 4.2. Battery Type. Li-Polymer. Battery Capacity. 2000mAh. Charge Parameter. 5V/1A. Charge Time. Appr. 3h. Battery Life. Appr. 8h (Highest keypads brightness). Dimension. L24.5*W15.7*H5.5CM(button included)