Fully compliant with textbooks ◯ Explanatory Text To acquire "usable English," it's essential to listen to a lot of authentic voices. The SD Repeater is a very convenient learning tool for the diverse content of Progress in English 21, allowing you to quickly access the parts you want to hear, and easily repeat and record. Please master English, the "international language," using the SD Repeater. *An SD Repeater is required for playback. Textbooks are not included. Played 1-2 times. Please understand that this is USED. Case is missing for item 1 only. English IN ENGLISH English learning materials