CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (energy on/off and mute) and four indicator lights (exhibiting in the event the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s an influence overload) around the front of your unit. Picture: https://judo-history82581.bleepblogs.com/36734735/indicators-on-ups-battery-system-you-should-know