CyberPower’s CP900AVR has a simple-to-use interface with just two buttons (electricity on/off and mute) and 4 indicator lights (displaying if the device is turned on, when the battery backup kicks in, when AVR is activated, and when there’s an influence overload) on the front from the device. Image: Michael Hession https://thepartysetter37147.blog2learn.com/83921903/getting-my-ups-battery-tester-to-work