CyberPower’s CP900AVR has an uncomplicated-to-use interface with just two buttons (energy on/off and mute) and four indicator lights (showing once the unit is turned on, once the battery backup kicks in, when AVR is activated, and when there’s a power overload) to the front on the device. Picture: Michael Hession https://judo-history-theory-pract61593.dsiblogger.com/69314407/5-simple-statements-about-ups-battery-tester-explained