CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electrical power on/off and mute) and four indicator lights (displaying if the device is turned on, once the battery backup kicks in, when AVR is activated, and when there’s a power overload) over the entrance of your device. Image: https://tysonacbzz.nizarblog.com/36525102/fascination-about-battery-ups-long-wp5-12-12v-5ah