A4Tech RG-20KM User Manual - page 5
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Hardware Installation
Step 1: Inserting the Batteries
A. Press the tab on the battery cover
locates on the mouse/keyboard
bottom as shown here and
remove the cover.
B. Insert the supplied batteries, making sure that the
positive (+) and negative (-) ends of the battery
match the polarity indicators inside the battery
housing.
C. Slide the batter cover back into its
position until it “clicks” firmly into place.
Keyboard