The GreenPower MP HDP 900G 8-Outlets Surge Suppressor provides the advanced protection you need to keep all your valuable equipment protected against even the most powerful surges. The Exclusive Dual Mode Plus automatically disconnects to isolate your equipment from harmful surges and spikes. It also sounds an alarm to let you know that the Surge Suppressor has protected your electronics from dangerous power conditions. It features patented HD Clean Power filtering that is precision-engineered to remove electrical noise and interference. This protects the delicate circuitry inside your HDTV and other electronics from unnecessary wear.