A mains electricity (AC-powered) device designed for total elimination and/or inactivation of microorganisms from medical devices and related products using hydrogen peroxide (H2O2) gas with low humidity content as the sterilizing agent; it is typically used for products sensitive to high temperature and humidity. It includes a treatment chamber where the devices to be sterilized are placed, usually after cleaning of gross debris, and a means to introduce the gas into the chamber; it is not intended to generate a gas plasma. The device is available in a variety of shapes and sizes, including stand-alone (bulk) and tabletop units.