What is the purpose of the plastic ring on the MacBook Air charger?

I use MacBook Air.

If you look at the charger, there is a plastic ring, so you can put it in and out.

I don't know what this is for, but what is it used for?

1234 2017-07-19 Gentleman

popular Why does it say that your license has expired on your phone?

popular What is the nationality of Minnie?

popular How can I resolve TLS security configuration errors?

popular How can I connect to watch a video on my phone on TV?

popular What is the deadline for purchasing lotto?

Same Tag Please recommend a Mac lip product that's good to use for LABOM

Same Tag Would it be good to do apple care?

Same Tag What is MacRubou Cheap?

Same Tag Can I change the Mac lipstick I bought at the department store to another one?

Same Tag The charger doesn't charge the iPhone, so why is that?

Same Time How many people can drive a car with a type 1 normal license?

Same Time What is the purpose of the plastic ring on the MacBook Air charger?

Same Time Can I use VR or S-note with Galaxy Note FE?