Lecturer Dr. Wanlapa Wasanasompong, Lecturer in the Department of Public Health and Health Promotion College of Allied Health Sciences Suan Sunandha Rajabhat University Samut Songkhram Province Education Center together with the Faculty of Science Rajamangala University of Technology Krungthep Design and develop teaching materials on analog time systems for preschool children with hearing impairments at Thungmahamek School, Bangkok.