Crystal Clear Calls The advanced Bluetooth chip creates a fast and stable connection to your Bluetooth devices. A high-quality Microphone built-in enables you to one-click to take a call(In Bluetooth mode) without holding your phone, offering a more convenient way to get more tasks done fast and easily. Wireless & Wired Mode Low power consumption technology applied, DOQAUS Bluetooth headphones with a built-in 1000mAh battery can continually play more than 90 hours after one full charge. By including a 3.5mm audio cable, the wireless headphones over the ear can be easily switched to wired mode when powered off. AUX Cable By including a 3.5mm audio cable, the wireless headphones over the ear can be easily switched to wired mode when powered off. No power shortage problem anymore What's in the box 1 X LIFE 4 Bluetooth Headphones 1 X USB Charging Cable 1 X 3.5mm Audio Cable 1 X Packing Box 1 X User Manual