Advanced Bluetooth V5.3 and Quick Auto Pairing: Featuring advanced Bluetooth V5.3 technology, wireless earbud greatly improves transmission speed and reduces sound signal loss. There is almost no delay in the gaming/watching videos/listening music. Bring you much better using experience. After first connection, these bluetooth headphones will automatically connect with your device once you open the charging case, which is faster and more convenient. Stereo Deep Bass and Clear Call: Wireless headphones adopt with DSR lossless HD rendering technology and equip with premium 13mm dynamic driver-the drive area is 4 times than the normal drive area, making the bass punchier and midrange full and textured, treble crystal crisp. Large chamber acoustic design well balances the internal and external air pressure to avoid sound loss, wireless earphones are combined ENC noise cancelling mic ensuring you can be heard clearly even in noisy environment.