new batteries at hand before you follow the steps
below.
1. Turn the device off and turn it over.
2. With the Phillips screwdriver, remove the
screw to the battery cover and then remove
the cover.
Do not remove the screws at the sides of
the device.
3. Remove the old batteries and quickly
replace them with the new batteries with
the positive (+) side facing up.
4. Replace the battery cover.
This unit may change operating modes due to
Electro-static Discharge. Normal operation of
this unit can be re-established by pressing the
reset key,
or by removing/replacing batteries.