The 15 Amp P-1800 AR delivers a stable 120 volts of AC power to protect equipment from problems caused by AC line voltage irregularities such as sags, brownouts, or overvoltages - all of which can cause sensitive electronic equipment to malfunction or sustain damage. The P-1800 AR accepts input voltages over a wide AC voltage range and transforms it to a constant output of 120V, ±5V. Voltages beyond that range may also be converted to usable levels, depending on the range variance.