Hospital grade for patient safety and consistent operation of critical equipment, these receptacles meet all required hospital standards. Tight plug tolerances limit the risk of critical equipment being unplugged by accident. 4-in-1 provides a larger number of outlets with a more utility oriented appearance. Indicator light standard on all surge protection receptacles, the indicator light assures you that your critical equipment is protected. Audible alarm for locations where the outlet is hidden or for an extra measure of safety, audible alarms alert you when the receptacle needs to be replaced. NEMA type 5-20R.