CyberPower’s CP900AVR has a simple-to-use interface with just two buttons (electrical power on/off and mute) and four indicator lights (displaying if the device is turned on, when the battery backup kicks in, when AVR is activated, and when there’s a power overload) to the entrance of the device. Photo: Michael https://coco-agriculture82592.izrablog.com/36778713/indicators-on-ups-battery-for-home-you-should-know