Although, it is a child instrument, basically a toy - it is much more than that. 3 octaves as sufficient for most songs. It supports not only the piano, but also guitar, accordion, flute and others. The test of notes could be very useful for the music classes training the note recognition. Headphones makes the place quite for the others. And USB power support makes it not necessary to change batteries. However portability with batteries remains a great plus. You can play everywhere, literally - even in the toilet :) As a minus I could say old mini USB support (as it is quite mature model), no support of bluetooth headphones or external speaker, and no light on the keyborad keys.