1, Dr. Rui's earphone 40mm sound generating unit, high-definition sound quality, built-in high-definition microphone, sound quality is not lost, and you can talk clearly when studying or answering questions.

2. This headset can switch multiple modes with one button. When you go out, you can plug in the card and listen to music and English offline. When there is no power, you can use plug-in mode, Bluetooth 5.0 wireless connection technology, tablet or notebook phone at home, etc.