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 device is turned on, once the battery backup kicks in, when AVR is activated, and when there’s an influence overload) around the entrance with the device. Image: Michael Hession https://mixedmartialartsmma96936.bloggazzo.com/35275482/the-2-minute-rule-for-battery-ups-450-apc