Insert a screw driver tip in it and slightly twist it it will remove the top of the case.
Change garage door opener battery.
How to change the battery on a liftmaster door opener remote.
If the door works then you re good to go.
Repeat the same process for the remote taking out the old batteries and replacing them with new ones.
The battery in your remote usually lasts between 2 and 5 years depending on the battery and how often you use your remote.
To replace the battery open the case.
If your garage door opener operates via remote control you can remove the old batteries by simply sliding the door located at the back of the remote control.
That garage door remote control is an extremely handy little gadget allowing you to open and close your garage door without ever leaving your car.
Like most electronic gadgets these days your garage door opener remote is operated by a battery.
If you use a garage door remote and the door still isn t opening then it may be the batteries in the remote that are dead.
There is a slide on the side of the remote.
Remove the old battery and replace it with a new one placing it positive side up.
Other types of remote controls have screwed in locks at the back so you may need to use a screwdriver to get the batteries out.