As the name implies, the sheath plays a protective role. It's best to wear a sheath. Some people are not used to wearing a headset sheath, but it depends on their personal preferences.

I hope it will relieve your confusion. You can ask me directly if you have any questions, and I hope to adopt them ~ ~ ~

If you want to know more about Bluetooth, please pay attention to "How much do you know about Bluetooth". Baidu, you will know.