Built with BT5.0 version, it offers high data transfer speed, stable connection and low power consumption., Multi-functional Tou-ch control let you take calls, switch songs, or control volume simply by touching these in-ear wireless headphones all without taking your smart phones out of your pocket., Built-in high sensitivity mic, it provides high-quality clear sound and great talking experience to you., Auto power on and fast pairing between left and right earbuds. Easy and quick to pair with BT-enabled audio devices. Effective distance is about 10-15 meters in open space., Wireless dual ear design, left and right ear channel separation. You can use the headset solely, or used them in pairs.,