CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electrical power on/off and mute) and 4 indicator lights (exhibiting once the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s a power overload) to the entrance with the unit. Picture: https://bydatto3extendedrange27147.frewwebs.com/36793716/5-easy-facts-about-battery-ups-ย-ห-อไหนด-described