ERGONOMIC DESIGN –This Bluetooth earphone perfect fit your ear structure and will give you unprecedented wearing experience, more comfortable for long wear, break away from the cable bondage, you will be fall in love with it in first wearing of the ergonomic earplug design. Only for RIGHT EAR wear. | HIGH VOICE QUALITY - Noise-cancelling microphone reduces background noise (CVC 6.0) allows you to have a clear wireless conversation with others. Crystal clear and nature voice. | PAIR WITH 2 BLUETOOTH DEVICES - Pair with 2 Bluetooth devices at the same time. | Durable Battery - Only charging 2 hrs, With 240 hours(10days) of standby time,8 hours of music time and 8 hours of talking time. | STRONG & STABLE BLUETOOTH SIGNALS – Barrier-free transmission distance: 33-35ft (10meters).