The APC Smart-UPS C SMC2000i2U is a 2U rack-mount line-interactive UPS with automatic voltage regulation (AVR) and power conditioning, correcting minor sags and surges without switching to battery power at all — extending battery life versus a unit that switches to battery for every small fluctuation. At 2000VA/1300W it's sized for a modest server or networking rack, with a front LCD graphics display for at-a-glance status, bundled monitoring software for integration into IT alerting, and both USB and serial interfaces for connecting to a management PC or network card.