RING app alarm Door Window Contact Sensor -fix Red Light, No Green Light, No Pair, Not Connect-RESET

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This Video is to show how I fix the issue on RING contact sensor which cannot pair or connect to my RING security system. It only shows RED light or No light. I used brand new battery and still did not work.
The solution is there is a small hole (reset) which you can put a paper clip or push pin in. It will have a click sound after you push down that button. It will then change from RED light to solid GREEN and then blinking GREEN. After this, your contact sensor should be working.
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NOTES: if you want to know how to change transformer for RING door bell, please let me know. Thanks