Belkin AP30800fc10 PureAV Home Theater Battery Backup with AVR Technology (Black) (Discontinued by Manufacturer) Contain Microprocessors, Hard Drives, And Delicate Circuitry Can Be Easily And Irreversibly Damaged By Blackouts And Large Power Fluctuations Maintains Constant Power Delivery To Your Components Ensuring That The Memory Recordings On All Of Your Equipment Will Be Saved In The Event Of A Blackout Automatic Voltage Regulation (AVR)