Exclusive isolated filter banks eliminate interference between your connected equipment. Unit safely filters EMI/RFI noise from 40 to 80 dB. Three diagnostic LEDs vividly alert you to potential power problems. Ultimate Lifetime Insurance (USA and Canada only) safeguards all your connected equipment. UL/cUL Listed for added peace of mind. Robust surge suppressor with sine-free tracking exceeds IEEE 587 Category A and B specifications. Indestructible, all-metal housing won’t burn, melt or crack.