The Merry Orchestra sound poster contains information, sounds, and depictions of the most popular musical instruments. The poster has a water-resistant surface and can be placed on a table or on a wall. For economy of battery life, it automatically switches off when there is no action for a period of several minutes. Features regulatable volume for the sounds produced. On the poster there are sensory buttons: an "Explanation" switch that provides short information about a musical instrument. Buttons activate the sound of a musical instrument. There is an "Exam" switch that, when pressed, checks your knowledge by having you answer questions. Given two presses in the case of a negative answer, it moves on to the next question. Synthesizer sounds: Selecting an instrument and pressing a note button can reproduce not only suggested songs, but also other melodies.