Digital display size is 0.99 inch displayed in green Left button: In Boot default state the display show voltage * * * U. when push button the display shows working current *. * * A. Press button again voltage and current alternately display (5s). Press button once again back to initial voltage state. Right Button: Be used to switch voltage mode Voltage Indicator: When voltage indicator lights on the digital display shows input voltage. When voltage indicator lights off the digital display shows output voltage. Current Indicator: Show that the module is in constant current state. Voltage potentiometer(VADJ):Adjust potentiometer clockwise the output voltage increases. Adjust potentiometer counter-clockwise the output voltage drops. (In constant voltage working state) Current potentiometer(IADJ):Adjust potentiometer clockwise the output current increases. Adjust potentiometer counter-clockwise the output current drops (In constant current working state).