CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (power on/off and mute) and 4 indicator lights (demonstrating when the unit is turned on, in the event the battery backup kicks in, when AVR is activated, and when there’s a power overload) to the entrance of your device. Image: https://israeljkjin.verybigblog.com/35391840/getting-my-battery-ups-backup-to-work