Great for several stages of development, kids will be captivated by the many activities on this infant play gym. They can lie on their backs on the mat while reaching up and grabbing toys hanging from an arch. This lets them explore different textures and discover colors. As they get older, kids can start kicking at a built-in piano to make fun sounds. You can also tip the piano up so it's horizontal with the floor and let them use their hands and fingers to play it. The gym is a great option for both tummy time and play while sitting. Mat is machine washable. Requires 3 AA batteries (included). 36"L x 27"W x 18"H; 4-1/2 lb. Ages newborn to 3 yrs.