HI, I bough Cyberpower CP1500PFCLCD UPS to regulate the voltage at my house. I dont know how to acces to the device settings to set up a maximum Voltage like 120V. It show normally between 118 and 123V, In an Hour. It constantly jumps buy +-1V in like a minute. I would like to know if its okay 123V for my stuff and when it vary constantly. I heard people say electronics works in range of 110-120V, and can take a +-5% of variation.I know I cant have it constant 120V unless I buy the cyberpower OL1500RTXL2U which locks either to 110, 115, 120 or 125V (not considered as Voltage Regulator).Thank you