Open-Back Earphones The open-back earphone design of the sports earphones can help you always be aware of your surroundings. Whether you are walking, running or cycling with your sports earphones, you can always pay attention to your surroundings and it is very safe.Comfortable and Lightweight Design The sports Bluetooth earbuds are very light, only 1 ounce, and you will forget their existence after wearing them for so long. The body can be adjusted to different angles through 360 bending, wireless and unrestrained, and the skin-friendly hypoallergenic silicone material is more comfortable to wear. X9 wireless running earphones allow you to wear them without burden.Waterproof and sweatproof Professional-grade waterproof fully enclosed sound cavity prevents daily sweat and rain from penetrating. The skin-like material can be refreshed with a simple wipe. The ergonomic design is comfortable and stable to wear, whether it is running, jumping or other large-scale movements, the earphones are still stable to wear.Bluetooth 5.2 & Clear Calls This open-back earphone is equipped with a Bluetooth 5.2 chip, which has a more stable connection, faster transmission speed and stronger signal. Microphones with environmental noise reduction technology work together to monitor the sounds around you and instantly generate opposite signals to reduce background noise, allowing you to hear clear calls, just like you are communicating with others face to face.Premium sound quality and safety guarantee This bone conduction headset has upgraded sound quality through patented speaker and acoustic cavity technology, effectively reducing sound leakage, protecting your privacy and bringing you high-quality audio enjoyment. Whale cavity stereo surround sound, immersive music enjoyment. Perfect sports companion.