Speaker
The speaker consists of an amplifier and a speaker. It is powered with USB (5V) and uses a normal headphone jack for the audio input.
 
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Speaker with labeled connections  | 
Amplifier and speaker unit  | 
The speaker consists of an amplifier and a speaker. It is powered with USB (5V) and uses a normal headphone jack for the audio input.
 
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Speaker with labeled connections  | 
Amplifier and speaker unit  |