The K-4m adds a multi-media version to our wildly successful K-4 line of educational headphones. The entire K-4 series is designed to meet the needs of "small" children. Most educational headphones droop all over their small heads K-4's are sized for proper fit and built to be tough enough to survive a year in the classroom. Shared headphones pose a significant sanitary risk exposing children to viruses, bacteria and parasites when headphones are passed from one child to another in a short window of time. SchoolPHONES are a KID/Teacher friendly solution to the growing need to use headphones in the classroom.