Full bass, high-pitched, bright, rich details in the ear beat, and improved tuning and calibration are all achieved with the 40mm Full Frequency Horn. double connection methods. When the headset is not powered on or the device is not Bluetooth compatible, use a standard 3.5mm audio cable. The 2.6-cm stretchable headband allows you to freely adjust lifting comfort to suit various head shapes. Balance the left and right earmuffs and have two battery lives. 500 mAh high capacity, 4 hours of charging time, 22 hours of Bluetooth operation, and no power concerns. Wide wireless coverage, stable data transmission, low power consumption, compatibility with all Bluetooth devices, and a 24 Mbps high-speed transmission speed are all features of the Bluetooth 4.2 chip.