[Open ear design for sports]: the bone conduction headphones are equipped with ear hooks that fit comfortably in your ears for a long time. The open ear design of the headphones helps you pay attention to your environment. Whether you wear it while cycling, walking, running, exercising, driving or cycling, you can always be aware of your surroundings and be very safe.[Bluetooth V5.2]: The Bluetooth hands-free headset uses Bluetooth 5.2 chip technology, which provides a clear sound and a stable connection, so you can listen to crystal clear calls, as if you would communicate from face to face. This Bluetooth mobile phone headset can also be connected to 2 devices at the same time, so you can separate your life and your work. Even if you have two phones, you will never miss a call again.[Comfortable and easy to wear]: the 270 adjustable earphone fits perfectly with your left or right ear. The bone conduction headphones are lightweight, with ear hooks and ergonomic ear design, they are stable and do not move, carry no weight for long-term wear and not easy to fall off during exercise.[Built-in battery]: Built-in high-performance lithium battery with 300 mAh, 48 hours continuous answering machine, approx. 30 hours music playback time, 365 days standby time, 1 to 2 hours fast charging. Wireless headphones have IPX7 protection that can withstand daily water splashes, sweat and rain and can be used as sports Bluetooth headphones.[Flexible control]: switching tracks, adjusting the volume, answering calls and waking up voice assistants are easy via headset control without having to constantly operate the phone, which is very convenient for office workers and motorists. Excellent quality and durability.