Features: X7 Open-ear headphones adopt the bone-conduction technology which delivers premium-audio through the cheekbone, allowing you to be aware- of your surroundings while listening- to music. Advanced bluetooth-compatible v5.3 headphones with mic-, wireless headphones free you from cables and you'll feel like the music has become a part of you Ultra-lightweight and waterproof design to maximize fit and comfort, you will not feel any pain even after prolonged wearing,perfect choice- for sports enthusiasts, suitable for running, hiking, cycling, and even extreme sports, etc. 10-Hour strongly upgraded battery life allows you to enjoy continuous music, calls, audiobooks, podcasts etc. It also features excellent noise-cancelling technology during hands-free calls, suitable for long meetings and long calls. Not only perfect for sports, but also useful for business people who often work from home- and hold video conferences.​ Specifications: Item:X7 Bone Conduct Earphone Material: ABS+PC Bluetooth-compatible versioin: V5.3 Battery: 160mAh Voltage:5V 150mA Charging- Time：about 2 Hours Play-Time：about 10 Hours Audio- amplifier: ANT8112 Color：Black / Gray Size:approx Length 13cm/5.12in，Width 10.5cm/4.13in Weight: 135g Package Includes: 1 Set x Headphones 1 PC x User Manual note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.