Sub-Zero fridges typically feature a door alarm to alert users when the refrigerator door is left open. The door alarm is an essential safety and energy-saving feature designed to prevent the loss of cold air and maintain the desired temperature inside the fridge. If the refrigerator door remains open for an extended period, the door alarm will activate, emitting an audible alert or visual indicator to notify the user. This helps prevent food spoilage, preserves the freshness of stored items, and promotes energy efficiency. The door alarm serves as a helpful reminder to close the door promptly, ensuring that the refrigerator operates optimally while minimizing energy consumption and potential food waste. However, it's essential to check the latest product specifications directly from Sub-Zero or their authorized dealers for the most up-to-date features and functionalities.