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Advantages of wireless headphones: 1. Provide a pair of high-fidelity Bluetooth wireless headphones with a battery life of up to 35 hours. 2. You don't need to worry about master-slave restrictions, and enjoy one-click operation. 3. Appropriate size, easy to carry, can be used anytime, anywhere to achieve your wishes. Specification: Bluetooth specification: Bluetooth 5.0 Operating range: 33 feet/10 meters (accessible) Charging time: 1.5 hours Talk/play time: about 3 hours (varies according to volume level and audio content) Battery type: lithium polymer Multi-function button function (touch): Volume +: Touch the left earbud 3 times Volume -: Touch the right earbud 3 times Previous song: Touch the left earbud twice Next song: Touch two right earbuds Play/Pause: Short-touch earplugs Pick up/hang up the phone: short-touch earplugs Reject the call: touch and hold an earbud for 2 seconds Package Contents:  2 x wireless earbuds 1 x charging case 1 x USB charging cable 1 x User Manual How can I reset when the two headphones cannot be paired with each other or cannot be connected to your device? 1. Forget the Bluetooth "Hello 1" earbud device on your phone. 2. Remove the two earplugs from the charging case, and then close them. 3. Press and hold the multi-function button for the left and right earbuds for 10 seconds, and then turn off automatically. 4. Turn on the earbuds again, and after 2 seconds, double-click the multifunction buttons of the two earbuds to connect them to each other. After a successful connection, after resetting, please connect the earbuds to your phone according to the above method.