DL-100+ incorporates all of ONIC's digital language lab features but it is a cost-saving, elegantly simple and technologically up-to-date system which only requires one computer-the teacher's. it allows the teacher to use various digital multimedia files for efficient language teaching. This solution has past the FCC approval; the power source has past CE and UL approval. This is the first generation solution developed by our group; therefore, after more than twenty years development, this solution is characterized by stability in function and in sound transferring;