Features:1. True wireless technology, no need for a cord, easier to wear2. Comfortable open-ear design, less hearing damage, better awareness of surroundings, safer for outdoor sports3. Built-in 16.2mm super large speaker, digital sound enhancement algorithm, unparalleled listening experience4. Advanced directional audio transmission technology, avoids sound leakage, protects your privacy5. Smooth-curved silicone ear hook fits snugly against your ear and brings outstanding sports experience6. Case with 600mAh large-capacity lithium battery, rendering up to 20h total listening time7. Intuitive buttons with fast response and accurate control8. Auto connection once opening case, one-button reset, easy to operate Specifications:Name: Open-Ear True Wireless HeadphonesModel: JR-OE1BT version: V5.3BT range: 10m (barrier-free open environment)Frequency response range: 20Hz-20KHzMusic time: about 18h (70% volume)Calling time: about 12h (70% volume)Headphone battery capacity: 100mAhCase battery capacity: 600mAhHeadphone charging time: about 1.5hCase charging time: about 1.5hCycle counts: about 2 charging cyclesCase charging port: Type-CCase charging input: 5V⎓1AMaterial: ABS+SiliconeNet weight: an earphone (single) 11g; charging case 65g