CyberPower’s CP900AVR has a simple-to-use interface with just two buttons (power on/off and mute) and four indicator lights (demonstrating once the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s a power overload) over the entrance on the unit. Photo: Michael Hession https://cashnqmgy.p2blogs.com/35063204/helping-the-others-realize-the-advantages-of-battery-ups-backup