CyberPower’s CP900AVR has a straightforward-to-use interface with just two buttons (power on/off and mute) and four indicator lights (exhibiting when the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s an influence overload) on the front in the unit. Picture: Michael Hession https://elliottgiigf.myparisblog.com/36930611/helping-the-others-realize-the-advantages-of-battery-ups-backup