CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electricity on/off and mute) and four indicator lights (showing once the device is turned on, in the event the battery backup kicks in, when AVR is activated, and when there’s a power overload) about the entrance of the unit. https://kobkhetdesign82603.blogadvize.com/44133083/the-greatest-guide-to-ups-battery-price-in-sri-lanka