YEAHYO Bone conduction Bluetooth earphones. Purchased on Amazon and used only once. Works perfectly. 【Open-Ear Bone Conduction & Ultra-Lightweight Design】Our bone conduction earphones are a new type of earphone that transmits sound to the auditory nerve by vibrating the bones instead of the eardrum. This allows you to enjoy music without blocking your ears, and you can comfortably spend long hours without ear pain. They are especially ideal for "while-doing" activities such as running, weight training, housework, and telework. By not blocking your ears, you can clearly hear the surrounding sounds (car sounds, traffic signals, etc.), so you can use them with peace of mind, especially in situations where safety is required. For example, you can enjoy music while jogging, paying attention to the surrounding sounds. Furthermore, the industry's first ultra-lightweight design of 30g provides an exquisite fit that makes you forget you're wearing earphones. The lightweight and clear sound quality, and the feature of being less tiring to listen to, maintain comfort even during long hours of use, so you can enjoy them in any situation. Bone conduction Bluetooth earphones with 8 hours of continuous use, perfect for sports and desk work.