1500VA Rack mount UPS. Uninterruptible power supply - battery backup / power conditioner. 2RU, AVR, RS-232 & USB Interface; BlueBOLT compatible. Advanced noise filtering technology assures that today's ultra-wide dynamic range is maintained as it must be – pristine. Remember, less AC noise equals greater content, greater resolution, and higher definition. Provides substantial backup time for most critical digital A/V components. If more runtime is needed, a 1500VA battery pack (BATT1500-EXT, sold separately) may be used to further increase runtime. Given the nature of battery backup technology, high-current audio and video components such as power amplifiers, powered subwoofers, and high- wattage displays are not recommended.