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MX-450 OWNERS MANUAL
Replacing the Batteries
Open the battery cover by pressing the release and pulling back the cover
on the back of the control. Remove the cover.
Observe the + and - polarity
indications inside the battery
compartment.
Place the four AA batteries into their positions in the battery compartment
observing the + and - polarity indicators on the batteries.
Now, replace the battery cover by inserting the hinged end in first, then
snapping the cover back into place.