Where is the red meter note USB debugging? How to open USB debugging

1 we found the "Setup" in the Red Meter note "system" and there will be a "about cell phone" in the phone's system.

2 We click on "about the phone" and then we will see you "Android version", now we just click on the Android version four times, then there will be the USB developers you want the option of OH.

3) Now we return to the mobile home page, then also click "Settings" in the settings inside now there is a "developer option" Click to enter after we will see a "USB Debugging Mode", and then we can open the USB debugging mode here, then the Red meter note USB debugging has been opened.