12 Hours Playtime & USB-C Charging: With a built-in Rechargeable 320mAh battery, our bone conduction headphones offer up to 12 hours of continuous music (70% volume) on a single charge (takes only 2 hrs with type-C charging). You can easily enjoy using them during daily use without worrying about downtime. Bone Conduction Technology: Bone conduction bluetoeth 5.3 headset converts sound into mechanical vibrations of different frequencies, and transmit powerful sound to the auditory nerve through the cheekbone, bone headphones ensuring your both ears remain completely open to ambient sounds. Safe & Hygienic: Using bone conducting headphones to listen to music, keeps you away from the state of blindness during sports. Open ear design can avoid some dangerous situations from happening. Also the sports earphones do not go into your ear canals, achieve true painless and protect your hearing, clean and hygienic. Lightweight & Comfortable: Lightweight and Ergonomic designs