Commercial Grade - SurgeBloc Surge Protection Receptacles with Audible Alarm provide surge protection for hot to neutral, hot to ground and neutral to ground. Exclusive patented, replaceable module restores expired surge protection without interruption of power or need to remove and rewire device. Audiable alarm signals when surge protection has expired. Groudnign system fully isolated from common building ground. Noise protection against EMI and RFI standard. High impact thermoplastic mounting strap. Automatic ground will ensure wallplate grounding in properly grounded metal enclosure. Standard 6" (152.4mm) leads, stripped 0.50" (12.7mm).