CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (power on/off and mute) and 4 indicator lights (exhibiting if the unit is turned on, once the battery backup kicks in, when AVR is activated, and when there’s an influence overload) around the entrance of your unit. Picture: Michael Hession https://beau58b34.widblog.com/91152183/getting-my-ups-battery-tester-to-work