The SMART1500LCDXL SmartPro LCD 120V 1500VA/900W Line-Interactive Uninterruptible Power Supply provides battery backup and AC power protection against blackouts, brownouts, power surges and line noise that can damage electronics or destroy data. Ideal for backing up your desktop computer or audio/visual components, this line-interactive UPS switches to battery backup mode in milliseconds to keep your connected equipment running long enough to save files and shut down safely with no data loss. Eight NEMA 5-15R outlets protect against surges, as well as provide up to 12 minutes of UPS battery support at half-load (450W) and 4.2 minutes of support at full load (900W). You can get even more runtime by connecting an optional BP24V15RT2U external battery pack (sold separately). Automatic voltage regulation (AVR) corrects severe undervoltages as low as 75V and overvoltages as high as 147V without using any battery power. EMI/RFI noise filtering improves your equipment's performance and prevents damage. A 1038-joule surge suppression rating protects your equipment from harmful power surges. Space-saving NEMA 5-15P right-angle plug with six' (1.8m) cord connects to any NEMA 5-15R socket. Large rotatable LCD screen shows real-time input voltage, load, AVR, remaining battery runtime and battery statuses at a glance. With PowerAlert software (available via free download), the SMART1500LCDXL enables safe unattended system shutdown in case of a prolonged power failure.