Battery Tutorial: Key Fob (2GIG Key2)
"You will need one CR2025 battery and a small screwdriver to change the battery in your panic pendant.
Use a small Phillips head screwdriver to remove the screw located on the back of the key fob toward the bottom.
Pry the key fob cover apart with the screwdriver.
Slide the battery out of the battery clip and replace with a new CR2025 battery, positive side up.
Snap the key fob together and replace the screw.
Safely dispose of the old batteries.
For more information and tutorials, please visit support.vivint.com."