CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (electrical power on/off and mute) and 4 indicator lights (showing once 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 the unit. https://boboshabuandgrill27159.actoblog.com/37080426/5-tips-about-ups-lithium-battery-you-can-use-today