1. Open the charging case and you can automatically and seamlessly pair this device with your Bluetooth-Compatible device without any problem. You don't need any skills to use Bluetooth-Compatible earbuds. After a few seconds, you will enter the world of pleasant music. 2. The wireless earphones are ergonomic, comfortable and lightweight to fit securely on your ears. These in-ear headphones are made of abrasion-resistant material and are waterproof and sweat-resistant. More suitable for fitness and running enthusiasts. It has a strict process design, which can effectively prevent rain and sweat from entering inside your ears. 3.【Stunning sound performance】 Unique stereo sound quality and design give you the sound, you can feel more realistic music. Crystal clarity and deep, resonant bass with a finely tuned sound signature deliver immersive sound that puts you center stage. 4.【One Step Pairing Technology and LED Battery Display】 Open the charging case and you can automatically and seamlessly pair this device with your Bluetooth-Compatible device without any problem. You don't need any skills to use Bluetooth-Compatible earbuds. After a few seconds, you will enter the world of pleasant music. 5.【PORTABLE AND LONG BATTERY LIFE】 Bluetooth-Compatible V5.0 drastically reduces power consumption levels so you can get 4 hours of playback time. 10 hours with charging case, listen to realistic music for days. Go out during the day without power failure, listen to music while running, exercise, and do other things.