Widex RC4-1 - Manual (Page 9)

9
Inserting the batteries
The plus ( + ) sign on the batteries for your RC4-1 must
face upwards when placed in the battery compartment.
Changing the batteries
Always change both batteries at the same time.
When the battery is nearly exhausted, the
symbol will be continuously displayed. If the
symbol is only briefly displayed, you need not
change the batteries.