CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electric power on/off and mute) and 4 indicator lights (demonstrating when the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s an influence overload) within the entrance on the device. Picture: https://website-design92580.life3dblog.com/35144745/battery-ups-fundamentals-explained