Features: [BT 5.0 Technology]Adopting the most advanced BT 5.0 technology, the earbuds provide one-step pairing, faster transmission speed, more stable connection and lower power consumption. [Great Audio Performance]With intelligent noise reduction technology, K031 offers stereo and clear sound quality for game, music and phone call. [Large Capacity Charging Box]Equipped with built-in large capacity battery, it provides operating time with 4-5 hours and 200-hour standby time after a single full charge. [Comfortable Wear]Made of skin-friendly material with ergonomic design, the earphones fit well the ear canal and reduce ears pressure, ensuring in-ear wear comfort. [Life waterproof Sweat proof]Allow you to deal with various environments easily and enjoy sports freely. [Universal Compatibility]Widely compatible with iOS and Android systems.