ACREO Openbuds are next-generation, innovatively designed true open-ear wireless earphones, equipped with large 16mm high-quality audio drivers and a 3W independent headphone amplifier. They eliminate the discomfort of low-frequency vibrations found in bone conduction earphones, providing a more perfect sound field experience than bone conduction earphones. Furthermore, the ear-hook design offers a stable and comfortable fit, reducing fatigue even during extended wear. Each earphone is equipped with a high-sensitivity silicon microphone, working in conjunction with a professionally tuned ENC noise reduction algorithm to achieve high-precision call performance, making them ideal for various situations such as web conferences, telework, package delivery, driving, and customer support. ACREO Openbuds are developed based on the design ideas of Hi-Fi professional headphones, creating a new generation of open-ear wireless headphones. Using a maximum 3W independent headphone amplifier to drive the speakers, and after 15 months of research and development, repeatedly customizing three versions of the speakers and conducting 108 times of acoustic tuning, they ultimately deliver an unprecedentedly powerful sound field experience. Considering user convenience, ACREO Openbuds, like AirPods, come with a portable smart charging case, supporting wireless charging and smart sensing. The earphones can also be used separately and connect automatically. The earphones provide 6 hours of playback on a single charge, and up to 18 hours with the case. ACREO OpenBuds achieve the highest level of reliability with a dual waterproof design of structural waterproofing and nanotechnology, making them sweat, water, and rain resistant, and highly suitable for workout sports such as running and cycling. Operation has not been confirmed. Please purchase only if you understand. Opened for inspection and photography, so listed as "Like New". Never used. 1431