CyberPower’s CP900AVR has an easy-to-use interface with just two buttons (electrical power 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 entrance from the device. Image: Michael https://remingtonqdxpg.blogprodesign.com/57561282/not-known-details-about-ups-lithium-battery