Features: brand new and high quality Using high-quality materials, not easy to damage, no deformation, skin-friendly. Bluetooth-compatible provides instant pairing and stable transmission without interruptions. It can fast and stable transmission without tangling. With the superior lightweight design,adjustable earbud perfectly fits for your ears, this bluetooth-compatible earpiece would not cause any burden to your ears. The bone conduction earphone is strong and sweat proof, suitable for running, cycling, fitness, hiking and driving. Adopting exquisite energy gathering cabin design, built-in large-capacity 120mAh lithium battery, low power consumption, for stronger battery life. Specifications: Material:Metal Color:Black,Blue,Green,Red(Optional) Bluetooth-compatible Version: V 5.0 Operating Range: About 33 feet without Barrier (10 Meters without Barrier) Headset Battery Capacity: 120mAh for Play Time: About 8 hours Calling Time:About 8 hours Charging Time:About 1.5 hours IPX5 Waterproof Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Bluetooth-compatible Earphone 1x Charging Cable 1x Manual