CyberPower’s CP900AVR has a straightforward-to-use interface with just two buttons (ability on/off and mute) and four indicator lights (displaying once 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 with the device. Image: Michael Hession https://aikidohistory05812.canariblogs.com/the-fact-about-battery-ups-12v-9ah-that-no-one-is-suggesting-51151745