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10) On/ off power switch
Press to power on /off the speaker box
11a) Button
Use it to power On/Off MP3 player controller
11b) USB connector
Use it to plug in a USB device with MP3 file.
11c) MP3 control
Use this control to set the volume level of the MP3.
12) MP3 player controller
13)1/4” jack self-lock
14) speakon jack
PPHP123M/PPHP153M BACK VIEW PPHP121/PPHP151 BACK VIEW