1.Variable voltage and wattage 2.OLED display 3.Fast delivery 4.Cut-off Protection ... needs to be charged or changed, the unit will display the code “Low V.” The unit will cease to output ... 1.4 OLED displayWhen the OLED is set to display during use, it will show the corresponding information ... it has been set to display. If the OLED is not displaying any information, ...