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one key navigation,easily operate
p:switch button=switch up or down needle position under working mode parameter setting button=for setting parameter under parameter mode s: parameter storage button=under working mode parameter storage button=under parameter mode
-:speed up button=under working mode parameter up button=under parameter mode speed down button=under working mode parameter down button=under parameter mode
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multi-functional,usb connector
for charging cell phone,cooling fan,also can be used to upgrade software
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