I spend all my time teaching things about design, art, photo & fashion. I like to do it with videos, animations, etc, in order to be on 'the times'. These little speakers provide a extremely sharp sound, filling the classroom, without distortion even if I turned the volume up. The convenient design is about the same size and shape of a portable liquor bottle. The y provide with it a convenient flannel purse where you can put it away, avoiding scratching -the surface is particular brilliant.I never get it for the description here, but it was a very pleasant surprise to discover that if you pull a little arrow in the bottom there is a place where you can hide four AA batteries, making it even more portable: you can use the energy cord or the battery....