Protect computer, networking and telecom equipment from surges, spikes and line noise with this premium suppressor. Isolated filter banks eliminate interference between your connected equipment. Widely spaced outlets accommodate large transformer plugs without blocking remaining outlets. Three Diagnostic LEDs. Number of Outlets: 4 AC; Joules Of Surge Protection: 3,300 J; Protection Type: Power; Noise Protection: 40 dB to 80 dB EMI/RFI Noise Filtration.