What does the plastic ring on the headphone plug mean? What is the use?

What does the plastic ring on the headphone plug mean? What is the use?

555 time base automatic fast charging circuit diagram

Apple's new iPhone and iPad next year or abandoned Qualcomm chips

Apple's new iPhone and iPad next year or abandoned Qualcomm chips

How does the "Jade to survive" host version come exclusively from Xbox for half a year?

How does the "Jade to survive" host version come exclusively from Xbox for half a year?

ON Semiconductor Introduces World's First Extremely Expandable Next Generation Automotive Image Sensor Series

ON Semiconductor Introduces World's First Extremely Expandable Next Generation Automotive Image Sensor Series

To seize artificial intelligence outlets, Konka opened Zhiseijia era

To seize artificial intelligence outlets, Konka opened Zhiseijia era

LCD panel prices fell again! To get a grip on TV