Awei A920BL Bluetooth Wireless Sports Earphone has 20Hz-20kHz frequency response with remarkable sound. Here used advanced technology of multi-point connection, supports you to connect with two phones simultaneously and the latest technology makes it easy and fast to pair with Bluetooth devices. This earphone has 11.5mm driver diameter, 16 Ω±15% Impedance with 20Hz-20kHz frequency response. This earphone uses aluminum alloy material, which can reduce sound refraction and give you a fine metal texture.