BLUETOOTH 5.2 and Apt-X technologyAir9 True Wireless earbuds use advanced Bluetooth 5.2 technology and Apt-X chip. This technology has excellent improvements in connection stability, signal effective distance, sound delay, and system compatibility. It supports aptX, AAC, SBC for lossless audio transmission.Intelligent noise reduction and Hi-Fi stereo sound qualityBuilt-in MEMS microphone and CVC 8.0 noise reduction technology can effectively reduce environmental noise and enhance sound. The improved built-in microphone and high-quality graphene driver provide excellent sound and heavy bass, allowing you to experience music, movies, podcasts, calls, etc. in a whole new way.Single-step pairing and smart touchPick up 2 earphones from the charging box, they will automatically connect to each other, and then you can easily enter the Bluetooth settings of your phone in one step to pair earbuds. Air9 has a touch sensor function, touch multi-functions include play/pause, previous/next track, volume up, reject the call, voice assistant, and other functions.Digital screen and 24 hours playing timeThe wireless earbuds can play music for 4 hours after a full charge. The 650mAh charging box (USB-C that supports fast charging) can charge the earbuds 4 to 5 times, so the earbuds can be used for 24 hours. The charging box has a battery LED display to monitor the power of the charging box in real time, allowing you to distribute power more comfortably. So you can know when is the best charging time.