Microphone Stereo Sound QualityEach wireless earbuds have a built-in microphone, and the dedicated microphone can achieve precise voice pickup and isolate external environmental noise through algorithms, ensuring that others hear your voice clearly. No matter where you are, you get crystal clear calls for an immersive listening experience. Play Time Stereo Mono ModeThe Bluetooth headset provides an impressive 8 hours of listening time on a single charge, for a total of uninterrupted music playback. Wireless headphones can switch seamlessly between stereo and mono modes. The two earbuds can be used together or separately. Built-in dual LED power display shows the battery power of the charging box and wireless earphones more clearly. COMFORTABLE DESIGNThese sports wireless earphones are ergonomically designed to provide a snug fit while ensuring fatigue-free and long-lasting comfort. The flexible ear hooks fit your ears snugly and won't fall off even during strenuous exercise. There are 3 sizes (S/M/L) of earbuds for you to choose from to get the best fit. Perfect for sports, gym, workouts, hiking and more. Bluetooth and Automatic PairingThe Bluetooth chip ensures that the Bluetooth headset is connected quickly and stably within 15 meters, and the picture and sound of the wireless headset are synchronized, bringing you a better use experience. After pairing the device for the first time, the headphones will automatically connect when you take them out of the charging case.