Fully charged battery will last 8 hours.
Master volume control
Digital display
Previous(volume -) track
Pause and play
Next(volume +) track
Input mode (USB/AUX/BT/FM)
Recording function
Microphone priority function
USB port
TF card port
Treble control
Bass control
Microphone volume control
DC15V/50W in
Microphone echo control
Microphone input port
Charge LED.
Aux input (3.5MM)
Wire microphone Ant
Speakers output impedance:8-16Ω
Aux input
DC12V Battery input
AC power switch
AC voltage and charge input