CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electric power on/off and mute) and 4 indicator lights (showing 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 front on the unit. Picture: https://trenton27mta.blogunteer.com/35250028/5-easy-facts-about-battery-ups-ย-ห-อไหนด-described