In Norse mythology, which magical retail concept most closely resembles modern IoT (Internet of Things) retail technology in its function?

Throughout history, mythology and folklore have influenced how products are marketed and sold. From magical objects in ancient tales to mythical figures used in branding, the connection between commerce and mythology runs deep. This trivia tests your knowledge about how ancient retail concepts found in mythology relate to modern retail technologies and practices. Are you knowledgeable enough about both mythology and modern retail innovation to identify the correct answer?

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Odin's ravens Huginn and Muninn, who flew around the world gathering information and returning to report to him
Thor's hammer Mjölnir, which always returned to its owner when thrown
The golden apples of Iðunn, which kept the gods young and were carefully inventoried
The magical mead of poetry that gave inspiration and knowledge to those who drank it