Roll-Away Piano, with its built-in speaker, weighs less than two pounds and fits easily in a backpack or briefcase. It has 49 full-size resin keys and a flexible silicone pad that rolls up nicely for travel but lays very flat when you're playing. While the key action may be a little different than on your Steinway, this keyboard in its 7in x 11in pouch will go places your Baby Grand never could. Travel pouch included. Runs on 4 AA batteries (not included) or 6V UL adapter