CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (electric power on/off and mute) and four indicator lights (exhibiting once the device is turned on, when the battery backup kicks in, when AVR is activated, and when there’s a power overload) within the front on the device. Picture: Michael https://travisgfxri.bloggip.com/36388133/not-known-factual-statements-about-ups-battery