Medium Sealed Tube Development Materials Medium Echo EXP item. Provides 1,000 EXP.

A cylindrical storage that contains standard frequencies. To activate it, users must rotate the cipher wheel to the correct position. This medium-sized storage holds a greater volume of information compared to the basic version. Consequently, the database available for training is more complete, better optimizing the performance of the absorbed Echoes.
Sources
Huanglong Exploration
Tacet Field