Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: is it compatible with chamberlien 7220 garage opener ?
Document: My Overhead Door unit didn't offer any help either, as there were 4 buttons that were not labeled in any way (one of which ended up being the correct button to train the Skylink 89). Overall, I would recommend this product as a great value as long as it is compatible with your garage door opener. Just keep in mind that, at least in my case, lining up the DIP switch was unsuccessful.
Make sure you confirm your garage door opener is compatible with this keypad. I just bought a home with an old garage door opener that only came with one remote and no keypad. Several times I've come home and forgot the house key, but now I can still get into the garage. I have a Genie opener without IntelliCode (uses the old dip-switches). This took about 10 minutes to program and another 2 minutes to mount aside of the garage door. It works exactly as advertised and I'm very happy with the purchase.Pros:- Backlit Keypad.- Very inexpensive.- Since it's universal, I'll try to reprogram this to work with my next garage door opener as well or give it to one of my friends.Cons:- Missing the option to program multiple passcodes.- Uses 2 CR2032 batteries, not sure they will last very long.- Since this also uses dip-switches to program, it wouldn't be hard for someone to remove it from the wall and figure out the frequency it broadcasts to open the door.
Takes an engineering degree to program. Don't even think of buying this unless you have a very specific new opener of the few brands that it is compatible with. Have to program 4 different functions and if it doesn't work - you have no idea which function is not working and in need of re-programing. Find a different product if you are smart!
It didn't work for my garage door opener,  which the front of the package said it was for my model.
My garage door is the old style dipswitch model. This opener matched up easily with it. Very satisfied with it.
The Skyline 89 was easy to set up and worked perfectly even with the older garage door opener. Recommended. @
It simply does not work. Additionally it looks and feels very cheap. Maybe it would work for some other garage opener? But it did not work with my 2010 craftsmen.
Instructions were vague,  Had to remove a link that was so small it flew out and promptly disappeared in my carpet. Never did find it. Could not get the opener to work with my garage door.
This unit was to be used to open my old Stanley non-digital garage opener. After setting the dip switches and adjusting the pin connectors, it worked great. Very good universal unit.
Programming was obtained by luck, instructions did not show my chamberlin model , i just happen to place switches in random order and it worked. however range was only 3 feet. when placed on garage door wall 6 feet from opener it failed to respond.
Answer: yes