Fill your music with more fun and colors! Ergonomic fit, comfortably lightweight truly wireless earphones together with quality SOUL signature sound to enjoy your favorite music. SOUL SIGNATURE SOUND QUALITY - Uncompromised Sound Performance Goes to New Levels SMALL BUT POWERFUL - Truly Colorful and Ultra-Lightweight Available in 6 trend-setting colors, ST-XX allows you to define your own fashion style. ST-XX is made small and ultra-lightweight at only 4g per earbud. It's not only a listening instrument, but a fantastic accessory. You will know what it's like when function and comfort meet fashion. PORTABLE CHARGING BOX Handy and Compact Charging Box with 20 Hours On-The-Go ST-XX provides up to 3 times of charging, which is 20 hours in total. The long-lasting battery life saves you the hassle of having to constantly recharge your charging box. TRANSPARENT AUDIO MODE Be Aware of Your Surroundings by Hearing It ST-XX supports transparent audio mode that mixes ambient sound to the earbuds to enhance environmental awareness. AUTO PAIRING FUNCTION True Freedom with One Step Pairing Pair ST-XX with your device in just a sec without cumbersome operations. ST-XX can be automatically powered on and paired with devices instantly after taking them from charging case. Also can be automatically powered off and charged after putting them back into the portable charging box. No need to press a button, which is true freedom to you!