HDI Center for Assistive Technology Services (CATS) is the regional Assistive Technology Regional Center (ATRC) serving Lexington and the surrounding region. The objective of HDI CATS is to provide statewide comprehensive assistive technology (AT) activities in accordance with the federal Assistive Technologies Act of 1998, as amended. AT is any item or piece of equipment (both low-tech and high-tech) used to improve and/or maintain independence in the home, at work, school or play.