CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (power on/off and mute) and four indicator lights (showing in the event the unit is turned on, when the battery backup kicks in, when AVR is activated, and when there’s an influence overload) within the front of your device. Photo: https://josuef6pnm.loginblogin.com/43976773/battery-ups-fundamentals-explained