Modern home theater components contain microprocessors, hard drives, and delicate circuitry that can be easily and irreversibly damaged by blackouts and large power fluctuations. The PureAV Battery Backup maintains constant power delivery to your components ensuring that the memory, settings, and recordings on all of your equipment will be saved in the event of a blackout, brownout, or other large - or small - voltage fluctuations. Over time small voltage fluctuations can cause damage to sensitive home theater equipment. Most battery backup units switch to battery backup mode only if a power outage occurs. This leaves your home theater unprotected from constant voltage sags and surges that can damage your equipment. For this reason, the PureAV Battery Backup employs Automatic Voltage Regulation (AVR) Technology to maintain voltage at a constant level without the use of the battery. PureAV's AVR Technology constantly corrects for small voltage fluctuations to provide stable, clean power to all of your equipment. If a power outage occurs, the PureAV Battery Backup switches to battery backup mode until power is restored. Unrivaled quality and proven technology combined with elegant, simple styling are the hallmarks of the PureAV Battery Backup. The PureAV Battery Backup adds a sleek accent, whether placed alongside your home theater equipment or mounted in a professional AV equipment rack, and provides you with optimal control and protection of your AV components.