Digital scent technology (or olfactory technology) is the engineering discipline dealing with olfactory representation. It is a technology to sense, transmit and receive scent-enabled digital media (such as web pages, video games, movies and music). This sensing part of this technology works by using olfactometers and electronic noses. In the past few years, the olfactory technology product is expected to grow at a CAGR of 38.05% from 74.02 million USD in 2017 to reach 97.67million USD by 2025 in global market. The olfactory technology product market is a promising market; the revenue of top ten manufacturers accounts about 38.78% of the total revenue in 2017. The high-end products mainly come from USA and Europe.