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3.TF card function
5.Driving 2*4 ohm 3W loudspeaker
7.Connection:R+,R-,L+,L- is for loudspeaker positive/negative connection;BAT+,BAT- is for lithium battery postive/negative connection;SW is switch;USB is charging interface
1.When DIY,please connect with the battery when plugs in USB port for power supply
2.When uses FM function,please plug in USB charging wire