CyberPower’s CP900AVR has a fairly easy-to-use interface with just two buttons (electricity on/off and mute) and 4 indicator lights (showing if the device is turned on, when the battery backup kicks in, when AVR is activated, and when there’s a power overload) about the front with the unit. Picture: Michael https://wordpress07283.blogdon.net/what-does-battery-ups-12v-7ah-mean-52364586