Kind reminder: 1.Hello friend.Please check if the outer package is damaged when you receive it. 2.If there are any issues with the package, please contact us in a timely manner, and we will help you solve any problems. 3.What we need is stable customers, so we always adhere to the principle of service first. 4.Friend, if you feel satisfied with our product, you can leave a five-star review.If you are not satisfied, please contact us in a timely manner.We will give you a satisfactory answer.thanks 5.Usage matters：Please fully charge the product before using it for the first time, then turn on your phone's Bluetooth and connect your headphones.