Single, one-step operation starts automatic cycle. Average cycle time is approximately 30 minutes, and sterilization time is 16 minutes at 121°. Light sequence indicators show power to unit, cycle in progress, and whether cycle is successful or has failed. Interlock system prevents lid from being removed while pressure remains in vessel. A two-stage "over pressure" protection system incorporates a calibrated pressure release valve and a gasket offset device. Electronic detectors turn off power if there is insufficient water. UL approved.