Module properties: unfenced booster module? Input voltage:3-34V. Output voltage: continuous adjustable (4-35V). Output current:2.5A Max. Input method: IN + input positive poleIN-input the cathode. Output method: OUT + output positive pole the OUT-output negative pole. Adjust way: first right after the input power () between 3-34 v output voltage with a multimeter to monitor and adjust potentiometer. Adjustable output voltage: 4-35V. Digital tube: 0.45 "3-digital. Features: with voltmeter according to a voltmeter error is + / - 0.1 V the range 0 to 40 V. (note: to ensure that the voltage meter accuracy please make sure that the input voltage in more than 3V). Light press button switch measurement input or output voltage and an indicator shows which road is measured voltage; With functions of power lost memory after power on display for the last time measure the voltage value of the road; Long press the touch button for 3 seconds to close the LED display light press button to open the LED display again; With terminal blocks no soldering iron can also ease of use and retain welding line connection point; Maximum output current can be as high as 2.5A