The Huawei 20s supports wired earphones. You can use the earphones by inserting them into the 3.5mm headphone jack on the top of the phone. If the wired headphone jack you purchased is not 3.5mm, you can connect it to the Huawei 20s using a adapter. When connected to a wired headset, you do not need to open any Settings on the phone, the phone will automatically recognize the headset and output audio to the headset, and you can adjust the volume and sound quality in the Settings to make listening to music, watching movies, and more enjoyable. It's worth noting that the Huawei 20s shares the 3.5mm headphone jack with the main audio output, so if you need to use an external player while connecting the wired headphones, the wired headphones will fail.
The correct way to use Huawei wired headphones is to first plug the headphones into a computer or mobile phone, and then play music on the computer or mobile phone. Use headphones when App hungry.