CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (ability on/off and mute) and 4 indicator lights (exhibiting when 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. Image: Michael Hession https://trevoraeftw.izrablog.com/36778056/detailed-notes-on-ups-battery-price-in-sri-lanka