GE | (SHABBOSKEEPEROVEN) Shabbos Keeper for the OvenProduct Description During Shabbos or Yom Tov, the oven door may be opened at anytime even while the oven is running. Using strict halachic guidelines, Zman Technologies developed a unique method, allowing the door to be opened and closed without affecting the heating or other functions. Uses two separate models for Shabbos and Yom Tov. On Shabbos, the over will go into an automatic warm mode. On Yom Tov the oven will automatically cycle between warm