Thirty keys, each white one measuring 0.87 inch across, are spaced so that small fingers land on the right note without crowding two at once. A resonance hole in the body opens up the sound so each note carries rather than dying on the spot. One-key start means a 3-year-old can begin playing without an adult setting anything up, and 4 AA batteries make it portable to a grandparent's house or a classroom corner. The MDF and ABS build has rounded corners throughout, and the white music stand lifts out of its slot. At 18 by 9.5 by 3 inches and 5.5 pounds, it sits flat on a table or on the floor and stays where it is put during enthusiastic playing.