CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (electricity on/off and mute) and four indicator lights (displaying in the event the unit is turned on, once the battery backup kicks in, when AVR is activated, and when there’s a power overload) within the front on the unit. Picture: https://wax-gourd60470.wizzardsblog.com/36277146/detailed-notes-on-ups-battery-price-in-sri-lanka