I am selling my previous one because I purchased the same product. ■【Open-ear design that doesn't block your ears】 With the same design as popular bone conduction earphones, these earphones don't block your ears, allowing you to hear ambient sounds (car sounds, traffic signals, etc.) clearly. They also use silicone material, which significantly reduces the fatigue caused by long-term use of conventional single-ear earphones headsets. ■【Equipped with a microphone specialized for calls & ENC noise cancellation】 Improves issues such as noise often found in conventional Bluetooth headsets, delivering clear voices to the other party. The voice delay rate is overwhelmingly lower than conventional single-ear headsets. It excellently cuts out surrounding noise, and the weakness of being easily dropped has also been improved, making it ideal for web conferences, meetings, and various other situations. ■【With mute function & can connect to two devices simultaneously】 With the mute function, pressing the volume down button during a call will prevent your voice from being heard by the other party, effectively protecting your privacy. Furthermore, it can connect to two devices simultaneously, allowing you to connect your work and personal smartphones at the same time.