1. Upgraded Bluetooth 5.3 and onestep pairing: These Bluetooth headphones feature the latest Bluetooth 5.3 EDR technology, delivering a more stable connection, faster pairing, and universal compatibility. When the charging case is opened, the headphones automatically pair with each other (hall switch) and connect to the last paired device. Bluetooth 5.3 ensures efficient transmission, allowing you to enjoy music anytime, anywhere. 2. Clear stereo sound and CVC 8.0 noise cancelling: The J52 inear Bluetooth headphones are equipped with a 13mm graphene audio driver and AAC audio codec, delivering dynamic highs and powerful bass. The builtin quality microphone and lossless HD rendering technology provide an exceptional music experience. Advanced CVC 8.0 noise reduction technology effectively monitors and suppresses ambient noise for crystalclear calls. 3. Dual LED digital display and 42 hours of continuous music: These Bluetooth inear headphones feature a unique smart digital LED display that shows the remaining battery in exact numerical form. A single charge offers up to 7 hours of quality sound, while the included charging case provides an additional 5 full charges, totaling 42 hours of playtime. With the TypeC charging port, a full charge takes just 1 hour. 4. Secure and comfortable fit: The inear design of these Bluetooth headphones has been meticulously polished and refined to achieve the balance of aesthetics and comfort. Each earbud weighs only 3g, ensuring a lightweight and strain wearing experience. IP7 waterproof technology effectively protects the sports headphones from sweat and rain, making them ideal for workouts, work, and commuting.