1.Long battery life.The T9 workout earbuds can play music for 8 hours. You have the freedom to switch between single-ear and dual-ear modes. In dual-ear mode, the 600mAh charging case enables 48 hours of playback.When in single-ear mode, by alternating between the left and right earbuds in combination with the charging case, you'll obtain 96 hours of music time. Whether you're on the move, working out, or relaxing, the sports earbuds offer excellent audio without the hassle of frequent charging. 2.Stereo Audio & Clear Calls: Experience exceptional audio quality and HD voice technology with our Bluetooth headphones. Designed with 13mm large speakers, these sports wireless earbuds deliver sound with impressive depth and clarity. The balanced sound profile, enriched with deep bass, creates a wide surround sound, maximizing the soundstage. Additionally, the built-in microphones ensure your voice is clear and loud during phone calls. 3.Designed for a Secure Fit.The running headphones are ergonomically engineered and equipped with 3 different sizes of soft ear tips (S/M/L) as well as flexible earhooks. The earhooks enable the earbuds to stay securely in position during physical activities, avoiding accidental falling out. Select the most suitable ear tip to achieve a comfortable fit for extended periods of wear. The wireless headphones are waterproof against splashes and sweat-proof, suitable for sports exercise and running. 4.Bluetooth 5.3 & Seamless One-Step Pairing. When it comes to our wireless ear buds, after the initial setup, these true wireless earbuds automatically power on and establish a connection to your device the moment they are taken out of the charging case. With the Bluetooth 5.3 technology integrated into sport headphones, you'll encounter a fast and stable connection. The wireless earbuds are compatible with a wide range of bluetooth enabled devices like smartphones, TVs, computers, laptops etc. 5. One Key Reset. Every time you reset, the ear buds can restore to their initial and optimal performance. For your ease of use, we have made the reset process easy. When you are unsure about which devices the ear buds have been paired with before, simply place the ear buds in the charging case and press and hold the reset button inside the case for 5 seconds. This will clear the pairing of the bluetooth ear buds with all devices, and then you can easily connect the ear buds to your new device. 6. Press Button Control.The press button control on the ear buds enables precise volume adjustment, music switch, answer and end calls, and voice assistant activation when using both earbuds. In single-ear mode, the volume cannot be adjusted directly on the earbud. Kindly adjust the volume on the paired device for a satisfying listening experience, as this single-ear opertation focuses on providing essential audio features while conserving energy and maintaining signal stability.