Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: does it also supply backup power to the opener button/switch that is mounted to the wall?
Document: This unit is compact and works great. It makes the wall mounted opener foolproof. Very easy to install and set up.
Good product. It's good peace of mind if the power goes out. our garage door is just too heavy to lift without the opener.
Father in law has the 1st generation of battery backup Liftmaster garage door openers.Newer models have the battery inserted into the actual unit instead of sitting on top of the unit like this batteryHis battery started to beep every few minutes.Power cycle did nothing to correct.Purchased this battery and after installing everything was back to 100% working. No beeps
While this is an unnecessary extra, I'm glad I have it. I really didn't want to spend any more than I already was but my wife convinced me to. I have to say, we have had a few power outages and it has been really nice to just push the button weather you are in the garage or in the car. I hope it lasts a long time.
Buy this now - because when you come home to a house without power and you're sitting outside your garage door-it's too late. Oh sure, you can order it afterwards, maybe you'll even appreciate it more because you can &#34;remember the time we had to go through the house, manually open the garage door and then manually lower it?&#34;  Super easy to install - and does what it promises. It operates your garage door opener and the light when the power is out.
The Liftmaster Engineer that designed this unit should be fired. The unit is designed to be mounted to the ceiling of your garage. But to change out the batteries, you have to remove the lid. To remove the lid, you have to remove the four screws in the TOP of the unit; which means you have to have access to the top of the unit and thus you have to completely remove the unit from the ceiling before you can remove and replace the batteries.
Plus, I don't need to worry about anyone popping the emergency release by a popular method of breaking into garages, as with the battery backup, the pull cord can be removed. (I do keep a hook similar to a heavy coat hanger in the garage &#34;just in case.&#34;Great pricing from Amazon, much better than eBay and free shipping too.
Bought this as a gift to pair with the Liftmaster 3800 opener. I have installed the same system in my garage and am very pleased
I used this to replace the battery originally installed with the opener after 6 years. Easy, quick installation and it works. I hope it lasts just as long as the first.
We bought this battery just in case power goes out so we don't have to reset everything. Would definitely recommend
Answer: yes