Built-in Power Amplifier to Enhance the Audio Output Level
Switch Off Built-in Amplifier To Power Speaker Directly
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Volume: Adjust To Desired Audio Output Level
Amplifier On / Off: Switch On To Increase Audio Output Level
Note: Install One AAA / UM-4 / R3 Battery (Battery not included) To Power the Optional Internal Audio Amplifier
Only Connect To Headphone Jack, As Connection To Higher Output Speaker Connection Will Cause Damage.
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