From APC website" Automatic voltage regulation for protection against brownouts and overvoltages". Overall appearance is very good to excellent. Front panel excellent, markings excellent. Original power cord is vexcellent Tested at various input voltages- 119V in = 119V out, 113V in = 125V out, 98V in = 120V out. LEDS indicate optimal, low & high input voltage, also has an audible alarm. This is not a battery backup power supply. Measures "6.75W, 8.5"D, 5"H. Item #9124