First-time use of the BACKUP Battery:
Remove the protective tab to activate the backup battery.
To Replace the BACKUP Battery:
(1) Press down the flip on the left.
(2) Pull out the battery tray and remove the old battery.
(3) Place a new CR2032 battery into the battery tray with correct polarity
(+/-) as indicated.
(4) Insert the tray back into the slot.
5.