First, a sensor on Howard’s finger detects the color of an object and sends it to a processor in the armband. The armband holds an Intel Edison chip, which analyzes the color and breaks it down into its red, green, and blue components, creating an RGB signal. Then the chip coordinates the scent release: Based on the combination of red, green, and blue, three tubes of scented essential oil—one for each color—open into a mask to create a blended smell. Howard used grapefruit for red, tea tree for green, and lavender for blue. Finally, two small fans blow over the mouths of the test tubes, picking up the scent and carrying it to the wearer’s nose.