Bluetooth-compatible 5.3 technology, more stable connection, no delay for music, games, calls or movies, suitable for indoor and outdoor sports use, providing you with hands-free calls and the ultimate music experience Open ear design, HIFI sound quality, achieving high fidelity and clarity, bringing you a wonderful music experience One click control, easy to use, you can easily use it to play/pause, adjust the next song, or answer a phone call. It can also be used to activate Siri voice assistant, which is very convenient Flexible design, made of titanium alloy steel wire material, can adapt to different head shapes. Even if it is arbitrarily twisted and folded, it will not deform. When not in use, it can be placed on a table or hung around the neck for easy carrying Built-in 75mAh rechargeable battery for long battery life. With battery indicator light reminder, when the remaining battery is low, please charge the headphones Specifications: Bluetooth-compatible version: V5.3 Bluetooth-compatible distance: 10M Battery capacity: 75mAh Horn configuration: 14mm, 32 Output power: RMS 25mwx2 THD=10% Frequency: 150-18000HZ (+/-3dB) S/N: 80dB Product material: ABS plastic Package included: 1 x Neckband Earphones 1 x Charging Cable 1 x English and Chinese User Manual Other items not include