Feature: and high-quality made. - Our Bone-conduction technology and open fit design delivers music through your cheekbones while ensuring your ears remain completely open to ambient sounds for maximum situational awareness during long-term wear. - Stable Bluetooth 5.1 connectivity and convenient multipoint pairing compatible with your i - OS and Android smartphones, tablets, Macs, PC computers and laptops. - The large diaphragm is used for directional audio transmission without loss, creating a realistic surround sound field. - Titanium wraparound headbands are lightweight and flexible to ensure maximum comfort during extended wear. - These Bone-conduction headphones deliver wide range, bass and premium sound experience. - Compact, slim fit design allows you to enjoy continuous music and calls for six hours at a time. - Repels sweat, Dust-and moisture throughout your indoor or outdoor exercise routine. - Specification:Model Number: A9BT Version: 5.0BT Profile: A2DP, HFP, HSP, AVRCP, AVDTPOperation range: Up to 10 meters (no obstacle)Frequency Range: 20-20KHz - Receiving Sensitivity: 86d - BImpedance: 16Mic: -35d - B, anti-interference microphones - Waterproof: IP56Battery Capacity: 130mAhMusic Playing Time: up to 6 hours (depends on music volume)Standby Time: 3-5 days - Charging Time: about 2 hours - Package Includes:1x Conduction Headphone1x Charging Cable