Features: Rechargeable, equipped with 220mAh lithium battery, it can work for 12 hours when it\'s full of power, providing you with music all the time. They don\'t sit inside your ear so that makes it better to not worry about ear wax accumulating and having to clean it often. IP55 Waterproof, it will also be sweatproof, ideal for you to wear when you are running, cycling, climbing and so on. Lightweight and ergonomic, easy and comfortable for you to wear, making you feel like wearing nothing. Foldable design, giving it a compact size, you can fold it for convenient storage and make it space-saving. It will give you very good general bone conducting performance, harmless to your eardrum, safe to use. Flexible and adjustable, one size fits most people, suitable for both man and woman. Simple to operate with a few buttons, you can adjust the volume or charge it easily.