About This Item Latest Bluetooth 5.1 Technology: Compared to traditional Bluetooth 4.2, these wireless earphones incorporate the latest Bluetooth 5.1 technology. Enjoy faster transmission speed, an extended transmission distance, and enhanced data transmission. This technology ensures a powerful and stable connection, delivering high-quality, low-latency, and consistently stable audio signals. The wireless range extends up to at least 10 meters (accessible). HIFI Stereo Sound:Experience HIFI stereo sound with high-performance composite diaphragms that minimize sound distortion. These wireless headphones provide deep bass and crisp treble, creating an immersive musical experience. The built-in microphone allows easy call handling, ensuring clear communication while driving or enjoying music without external interference. LED Power Display and 1500mAh Battery: The Bluetooth headset comes with a large 1500mAh capacity charging box, offering up to 4 hours of talk time. A smart LED power display allows you to monitor the headset's battery level. Note: Language mode can be switched between Chinese and English by pressing the function key five times. Small Appearance and IPX7 Waterproof: The wireless Bluetooth headsets are ergonomically designed for a perfect fit with three sets of silicone caps (small, medium, and large). With an IPX7 waterproof rating, these earphones are sweat-resistant, making them an ideal companion for sports activities. Comfortable Design: The ergonomic and lightweight design ensures a comfortable and secure fit in your ear, eliminating discomfort, friction, sliding, or slipping. Suitable for extended wear without causing discomfort. Make sure to charge them fully before the initial use.