The SMART1500LCD 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 11.8 minutes of UPS battery support at half load (450W) and 4.4 minutes of support at full load (900W). 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 870-joule surge suppression rating protects your equipment from harmful power surges.NEMA 5-15P plug with 6-ft. (1.83 m) cord connects to any NEMA 5-15R socket. Large rotatable LCD screen with dimmer shows real-time input voltage, overload, AVR and battery statuses at a glance. Alarm sounds to indicate power loss or low battery. With Tripp Lite's free PowerAlert software (available via free download), the SMART1500LCD enables safe unattended system shutdown and file saves in case of a prolonged power failure.