MACARON is a Perceptual User Interface (PUI) device and supporting application that ensures easy use of screen interface-based apps and services in any physical environment. The device offers display and tag type so that users can select from multiple pre-mapped functions as the need arises. Users can access a needed function immediately without having to make frequent changes to the setting. The application helps select and manage contents with a shortcut feature. With a rising number of IoT instruments and O2O services, MACARON will help users manage and use them more intuitively in the physical world.