A count of 18 keys is a deliberate choice for the youngest players. Fewer keys means less to be confused by, and each one is spaced for little hands while still giving the touch of a great piano, so a three-year-old presses a note cleanly instead of catching two at once. Sound output is high quality enough to make the music feel real rather than like a toy squeak, which is what keeps a child coming back to it. The case is built from child-safe wooden boards, MDF and beech wood, with firm connections and exquisite craftsmanship that hold up to enthusiastic playing, and every corner is rounded so little hands stay protected during practice. At 11.5 in by 9.5 in by 3 in and 3.9 lb, it is a tabletop instrument that fits almost anywhere and can be carried from a table to the floor without help, giving it flexible daily use. A removable music stand keeps songs in view at the right angle and lifts off when the surface is needed for something else. The on and off switch sits at the back where a child can reach it independently, so turning the piano on is not a task requiring an adult. Four AA batteries are required and not included. In green, assembled from the included instructions, it is ASTM and CPSIA compliant, and it gives boys and girls over 3 a genuine boost in musical ability and fine motor skills.