Level I contains 34 lessons and will take about 14 hours to complete. Level I focuses heavily on teaching proper pronunciation. Due to the emphasis on pronunciation in this level, Chinese characters are not included in this level. Characters are first introduced in Level II. The first Chinese lesson introduces the four tones of standard Chinese. To help you focus on the tones, these Chinese lessons make use of only the simplest and most obvious consonants involved. The PDF that is included will be necessary for viewing the charts and graphs that are included as a learning aid, especially for Level I.