Attribution to ad campaigns of user interaction with product demo units

Online advertisers, such as brick-and-mortar retail advertisers, or consumer product brands that sell through such retailers face a challenge in attributing consumer actions, such as visiting a store, to advertising campaigns. The techniques of this disclosure make advantageous use of product demo mode of products displayed in-store to transmit a signal that boosts visit detection. The solution is robust to products being moved around a store or removed from display, since the product itself broadcasts the signal. The techniques also utilize the ability of a product to establish facts about its surroundings that enable richer reporting on store visits