CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (power on/off and mute) and 4 indicator lights (demonstrating if the unit is turned on, when the battery backup kicks in, when AVR is activated, and when there’s a power overload) over the front in the device. Picture: Michael Hession https://judobelt81357.blogsvirals.com/35319896/battery-ups-fundamentals-explained