Plug. Play. Believe. iFis AC iPurifier is for anyone whose audio is troubled by interference or distortion caused by dirty mains power. It will rid your system of electromagnetic (EMI) or radio-frequency (RFI) interference and brings clean clear sound to your audio in an instant. Military Grade The AC iPurifier uses iFis Active Noise Cancellation technology inspired by military engineering. It ACTIVELY eliminates far more noise across the frequency range than a passive product even across the lower frequencies. No Harm. No Hum. The AC iPuriifier boasts inbuilt earth/ground and polarity detection. You can always be certain the polarity is correct and that you have the necessary ground/earth connection. Smart Thinking Our Intelligent Ground system ensures the AC iPurifier will not introduce a ground loop when one isnt needed. Use the 4.4mm grounding socket safe in the knowledge that the AC iPurifiers smart thinking will keep your system ground loop free. No ground loops mean no annoying hum or buzz. Now thats music to our ears. Safe and Sound With in-built surge protection the AC iPurifier will shut down if it detects a short or a power surge. Many hands may light work And the same can be said for AC iPurifiers the more you use the cleaner the power. You can also add them to your power strip. Why not separate your digital and analogue devices to lessen noise contamination even further? What's in the Box AC iPurifier AC Mains Noise Filter Manual Specifications Noise reduction: 40dB ( 100x) Surge Protection: max. 30000A @ 1000V/10uS Operating Voltage:90V 265V Size/Weight: (USA): 1.57in (W) x 4.13in (L) 108 (g) / 0.24 (lbs)