Wear comfortable> with a ergonomic design, rotatable ear-hook & mic allow you to adjust the angle and you can switch them until the earphone fit in your ear right. astounding audio the wonderful sound quality will surprise you! it's very sensitive that you can answer and receive calls very quickly and clear. multidrop connection connecting to 2 devices at the same time! provide great convenience> 1 detachable wired headphone is included. replaceable silicone earmuffs are available. enjoy music and keep contact with the worlds> technical specification: - Bluetooth Version: 4. 1+Edr