A. Air Conduction Open Ear Headphones: Bluetooth headset with microphone will not go in or cover your ears compared to traditional headphones, it keeps the inside of the ear canal healthy and hygienic, offer a bud-free, pain-free wear for your all-day listening and also allow you to hear what is going on around, keeping you connected and aware of your surroundings to ensure safety while enjoying music or answering phone calls. (Note: Not recommended for hearing-impaired users.) B. 270° Noise Canceling Boom Microphone: The wireless Bluetooth headphones equipped advanced ENC noise reduction technology to ensure clear calls and good music experience. The flexible boom can rotate 270 degrees and be adjusted to the optimal position to better pick up your voice and improve call quality. It's suitable for use in a range of environments, like office, call center, driving, online learning, video conference, home working and commercial. C. Comfortable & Lightweight: The open ear headphones are designed to offer a comfort and healthy listening experience. The weigh only 28g is easy to wear for extended periods without causing discomfort or strain. The aluminum alloy backhanging + ear hang of the air conduction Bluetooth headset is strong and durable, tight close to the ear back that is stable without shifting or falling off. Bring your ears a comfortable wearing experience even when wearing a helmet and glasses. D. Advanced Bluetooth 5.3 & Multipoint Pairing: This wireless headset with microphone adopts the latest Bluetooth 5.3 chip, which provides faster mission, more stable connection, and more power efficiency. It has a mission range of up to 33 feet. Widely compatible with iOS and Android phone, PC, computer, tablet, laptop, iPad, etc. Bluetooth headphones can connect two devices at the same time, easy to switch devices to further improve work efficiency. E. If there are slight differences in the product, it does not affect the use. F. Colour: Black G. Mate