... 5)1year warranty 1)Liquid crystal display 128*64,with backlight,two languages(Chinese,English)display,touch button operation. ... .5) Mains overvoltage, under voltage, phase function, power generation, with over-voltage, under voltage, over frequency, under frequency, over-current ... users to change the parameters set, while the internal FLASH memory in the memory, the system is not lost when power-down, ...