Overvoltage: Overvoltage, undervoltage, and voltage display (voltage measurement). Adjustable overvoltage: Both overvoltage and overvoltage recovery values are adjustable, and the overvoltage action time is adjustable. Two adjustable values: Both the undervoltage value and the undervoltage recovery value are adjustable, and the undervoltage action time is adjustable. Two adjustable delay times: The fault recovery delay time and power-on delay time are adjustable. Overvoltage Value Range: OFF-80V-100V (Adjustable) 90V (Default) Size: 0.39 x 0.39 x 0.39 inches.