Brand new, unopened Bluetooth 5.3 Technology & Automatic Pairing: Equipped with the latest Bluetooth 5.3 technology. Compared to the previous generation Bluetooth 5.0 earphone chips, power saving and connection stability are significantly improved, achieving low latency and less sound interruption. It achieves more stable transmission, lower power consumption, and faster speeds when connected. No difficult operations are required, and it's easy to use. When connecting to a smartphone, it immediately enters pairing mode when turned on, allowing you to quickly connect via Bluetooth. Up to 35 Hours of Continuous Playback & Type-C Fast Charging: A high-quality battery is built-in, allowing for up to 35 hours of continuous use. You can use it anytime, anywhere without worrying about the battery level. Furthermore, it supports mainstream Type-C fast charging, and a 10-minute charge provides up to 2 hours of use! Recommended for those who travel long distances, such as commuting, gaming, running, traveling, and business trips. HI-FI High-Quality Sound & CVC 8.0 Noise Canceling: Newly designed, compact yet powerful, achieving HI-FI high-quality sound. Excellent spatial expression with the unique fit and enclosed feeling of canal-type earphones, providing refreshing sound quality and enjoying a sense of presence with the spread of sound. With CVC 8.0 noise-canceling technology, it reduces surrounding noise, allowing you to easily shut out noise and effectively reduce it. Even in noisy places such as downtown areas, train stations, airplanes, and trains, it supports clear music listening and calls without being affected by surrounding environmental sounds. Lightweight Design & IPX7 Waterproof: Weighing only 30g, you won't feel tired even after wearing it for a long time without feeling pressure on your ears. It also has IPX7 waterproof performance, resistant to sweat and splashes, so you can use it with peace of mind even if it gets wet from sudden rain or sweat from intense exercise. Suitable for jogging, running, yoga, sports, gym, cycling, etc.