To install the main batteries
To install the backup battery
a.Slide up the battery compartment cover as illustrated.
b.Insert 4 new AAA (LR03) batteries into the main compartment. Make sure each battery is inserted in the indicated direction.
a.Press down the holder. Push the plate to the shown direction and lift it.
b.Insert a new CR2032 lithium battery. Make sure its positive (+) side is facing up.
c.Replace the plate and push it to the original place.
After installing the batteries, press 
to turn the power on.
Warning: It is recommended that you replace this battery every 5 years. When the low battery icon is displayed, you need to replace the batteries as soon as possible.
However, avoid removing the backup battery and main batteries at the same time to avoid data lost.