``HSK Audio Pocket'' allows you to easily listen to the audio included with the ``Chinese Proficiency Test HSK Official/Authorized Series'' books published by Splix on your smartphone! For free! This is an app that can be downloaded. By using this app, you can study Chinese whenever and wherever you want, as if you had audio in your "pocket". This is a very effective app for strengthening your listening skills, learning by using free time, and learning by listening. *To download the audio of thi