Bluetooth 5.3 Technology and One-step Pairing: Our C16 wireless earbuds adopt the advanced Bluetooth 5.3 technology, supports A2DP, HFP, HSP, AVRCP Protocol, which provides faster transmission speed, stronger connection stability and longer range of bluetooth. The connection range is up to 15 meters away. Open the lid of the charging case, the wireless headphones can be automatically connected to the previous paired device, put back the charging case, the earbuds will automatically disconnect.Ergonomic Earhooks Design and IP7 Waterproof: Adjustable and secure fit rubber earhooks and ergonomic design ensure the bluetooth headphones stay comfortably firm in place when you are doing running, other outside activity etc. Equipped with 3 different sizes ear tips (S/M/L) giving you more choices. Through the use of ultra-light nanomaterials, the wireless earphones reach IP7 waterproof grade, which can effectively prevent the bluetooth earphones from the damage of sweat and raindrops.High-fidelity Audio and Clear Calls: The ear buds is equipped with a 13mm dynamic driver, adopts AAC/SBC audio coding technology and a unique stereo design to make the bass more powerful and the midrange full and textured. This noise cancelling earbuds built-in quality microphone and CVC 8.0 noise cancelling technology that effectively separates your voice from the ambient sound, makes the communication clear. You will experience a whole new world of crystal-clear phone calls.50 Hours Playtime and LED Digital Display: The bluetooth earbuds can last 8 hours after a single full charge and provides extra 40+ hours playtime with charging case. Once the earbuds put in the charge case, it can be charged automatically. Features with a smart LED digital display, you can easily know the battery consumption on both wireless headphones and the charging case so you can master the time to charge it. The sport earbuds can be fully charged within an hour by using the USB-C cable.