The CD-i player 300 series, which includes the 310, 350, 360, and 370 models. The 300 series consists of portable players designed for the professional market and not available to home consumers.[clarification needed (not available?)] A popular use was multimedia sales presentations such as those used by pharmaceutical companies to provide product information to physicians, as the devices could be easily transported by sales representatives.
Source: Wikipedia, "CD-i", available under the CC-BY-SA License.