Bluetooth 5.3, mini design, outside with soft silicone comfortable to wear, very light each one 10lb, and securely fits the earhooks, fashion style. Suitable for long-term wearing without discomfort to the ears. Listening to music without blocking your ears allows you to understand the surrounding situation while listening to music. You can hear incoming cars or ringtones when you are running, cycling or driving, effectively avoiding some dangerous situations. Comes with charging case, single earbud battery can work about 6 hours, match with charging case continuous can work 18 hours.