HD Sound QualityI16 true wireless earbuds equipped with high-fidelity chip developed by Inphic LAB provide you with HD quality sound. When you put on I16 True wireless stereo earphones, you'll feel like you are just on the music scene,whether it's folk songs, rock, or electronic music, etc.You'll have unbelivable immersive music experience with this wireless headphones.Ergonomic DesignYour ears will "love" this earbuds,cuz it's ergonomic design and can fit different ears'shape.You can wear it stably when working,jogging,hiking,workout,etc.You can control your earbuds with just a gentle touch.Instant Pairing & BT5.1Take out your earbuds and open BT function of your device.Tada~You'll find I16 on your device and press connect.I16 headphones wireless bluetooth 5.1 works well for iphone/android/WP.After first time pairing,everytime they'll pair automatically once you wear your headsets!You'll never need to take your music player with you,cuz BT5.1 offers stable connection up to 10M!40Hrs PlaytimeUpgraded Inphic built-in rechargeable batteries. The charging case can fully charge two ear buds from 0% power to 100% for 4 times. You can enjoy HQ music for 8 hours when the two earpods are fully charged. So now you have 40 hours of playing time! Enough to play 20 Hollywood movies or 600 songs, even if you are on a short trip, you can use it worry-freely.