CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (ability on/off and mute) and 4 indicator lights (displaying if the unit is turned on, once the battery backup kicks in, when AVR is activated, and when there’s an influence overload) on the front of your device. Photo: Michael Hession https://bdautogroup83603.dailyhitblog.com/41727632/new-step-by-step-map-for-apc-ups-battery