Advantages of CXK E8 Wireless Earbuds: 1. We offers a pair of high-fidelity Bluetooth Wireless Earbuds with up to 30 hours of battery life. 2. You don’t have to worry about master-slave restrictions and enjoy the single ear mode. 3.Super light-weight, easy to carry, can listing to music anytime anywhere. Note: 1. If the earbuds are not in the charging case or haven’t been put back into the charging case, the turn-on of the two earbuds is independent. You need to turn on both earbuds. 2. If the earbuds can not pair with your Bluetooth device or can not pair with each other, please try to reset them according to User manual or please feel free to contact us. Package Contents: 2x Wireless Earbuds 1x Charging Case 1x USB Charging Cable 1x User Manual