【Bluetooth 5.1 & Auto-Pairing】 Equipped with the latest Bluetooth 5.1 chip, which improves communication transmission speed, range, and stability, effectively solving conventional communication problems such as sound skipping, interruptions, and delays. You can enjoy music, games, and videos smoothly and to your heart's content. If the initial connection is successful, the next time you open the charging case lid, the power will automatically turn on and enter pairing mode, instantly pairing with your smartphone automatically. You can freely switch between both-ear and single-ear use, making these Bluetooth headphones stress-free to use.