Bose A30 AVIATION HEADSET Manual De Instrucciones página 29

5. Insert two AA batteries (alkaline preferred), observing proper polarity.
CAUTION: If the batteries don't fit correctly, do NOT force them in. Forcing
an improper connection will cause permanent damage to the
control module.
6. Close the battery cover, press firmly down on the finger indent, and slide the
cover into place.
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