You have to log in to answer this question. Begin inquiring to receive solutions CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (power on/off and mute) and 4 indicator lights (displaying once the device is turned on, if the battery backup kicks in, when AVR is activated, https://myleslwdkp.mybuzzblog.com/13665074/ups-ups-for-dummies