The J Type Power Conditioner with Battery Backup offers best value protection for home theater systems. Surge protected outlets keep all components safe from damaging surges, spikes and even lightning. Noise filter banks reduce electromagnetic and radio frequency interference that can harm picture and sound quality. Automatic Voltage Regulation (AVR) keeps voltage levels steady to ensure safe operation during low and high voltage conditions. Battery backup power keeps the home theater on, protects expensive TV bulbs and saves recordings stored on a DVR when the power goes out.