Provides surge protection for hot to neutral and hot to ground High Impact Thermoplastic contruction, BLUE LED indicators to verify surge protection and ground, Audible alarm indicates bad ground connection or expired surge protection. Front access switch for muting alarm until device is replaced Feed Through feature allows receptacles wired downstream to also offer surge protection; TVSS Transient Voltage Surge Suppressor (560 Joules) #14-10 AWG, 2 pole, 3-wire, grounding