Usually 3-5 Days. 45 Day Lowest Price - 100% Satisfaction Guarantee. The AR-PRO AC Line Voltage Regulator is intended to protect computer, audio, video and other electronic equipment from problems caused by AC line voltage irregularities-- sags, brownouts, or overvoltages that can cause sensitive digital equipment to malfunction, or, in extreme cases, to sustain damage. It accepts single phase input AC voltages anywhere within two capture ranges, 88 to 134 or 170 to 264 volts, and converts them to the North American standard 120 volts (or, if desired, 100V).