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1.Two earbuds are built-in mic.When you use the earbuds one at a time, ANY ONE MIC can working.But they both are used at the same time,only left mic can working.
2.SINGLE EAR & DUAL EARS MODE.You can use the earbuds one at a time, or they both are used at the same time
5.SUPER EASY PAIRING PROCESS.Take out U7 Bluetooth earphones from the charging box, then connect via phone's Bluetooth menu.
6.Advanced Bluetooth 5.0 with TWS technology.
Bluetooth Version: V5.0
Range: 33 Feet (10m)
Playing time: Up to total 12 hours with charging box
Charging Time: 2 hours