Input voltage:DC 4.5 ~ 30V Do not reverse or reverse,or will be damaged Output voltage:DC 0.5 ~ 33V Maximum output current: 7A Maximum output power:80W long continuous work Please strengthen the heat,it is best to leave a margin Conversion efficiency:91% (measured at 12V input,19V output 2A) Note:This module is a regulator module,without constant current function,can not output directly to the battery or LED (that is,the output can not directly connected to the battery,such as with the battery itself with a charging circuit can be connected,such as red charge Po,LED Drive there is no problem) Key Function Details: Fast press and let go (press the duration of less than 0.5 seconds),to switch the display input and output voltage,when the indicator is red when the input is the voltage,when the indicator is green,the output voltage The Press this button for about 1 second~2 seconds,let go after the closure of the monitor,and then press the button again to re-open the display. Press this button for more than 2 seconds,let go after the voltage display reference voltage reference,then the default display 3.33 and red light flashing,on behalf of the input is more accurate,short press the button to change the value,The range of values is 3.28 to 3.38.Press the button to change the value,adjust to the appropriate value after a long press the button for more than 1 second,save the set of benchmarks,and then press the button to change the value,Reference voltage and return to normal display.(Hint:When the displayed voltage is lower than the actual voltage when the large reference voltage,when the display voltage is higher than the actual voltage to adjust the small reference voltage) Reminder:the power module is sure to work,this module naturally cooling power of about 60W,such as a long time to work 80W,need to do appropriate to strengthen the heat,otherwise it will overheat protection.In the case of large current,there may be an inductive sound,which is normal. Size:7.8x4.7cm/3.07x1.85inch Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item.Thank you Package Includes: 1x Step Up and Down Regulator Module