CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (energy on/off and mute) and four indicator lights (displaying if the unit is turned on, if the battery backup kicks in, when AVR is activated, and when there’s a power overload) about the front in the unit. Picture: Michael Hession https://judahrrqon.buyoutblog.com/36232466/ups-battery-hsn-code-for-dummies