Ergonomics Design: The mini Earbud is designed according to that conforms with the shapes of your ear, earbud stays in your ear securely and fits for left ear . Regarding comfort,it feels so light and natural you’ll hardly notice it’s there. Universal fit:Super lightweight design weigh 5g only. Take this tiny Bluetooth earpiece anywhere and pop it into your ear when the opportunity arises, then enjoy listening to your favorite music .Only with a comfort and secure fit will you enjoy a powerful sound. Bluetooth V4.1 Version: Compatible with almost all the Bluetooth-enabled devices.Supports Multipoint Technology Can connect to two different devices in 10 meters range simultaneously. Support incoming number calling. Long Service Time: Built-in high performance rechargeable Lithium-poly 60mAh battery. High capacity battery provides 3- 4 hours call time or music playtime at 40-50% volume, full charge in around 1-2 hours and up to 120 hours standby time. Support Stream Music/Video/Audio. Its hands-free function would release your hands from answering the call during driving or walking. It designed with noise reduction and echo cancellation technology to filter ambient noise and enable clearer sound during calls and when listening to music.