Baby can stack the see-through blocks on the Giraffe or drop them in for tumble-down fun, complete with music and realistic sounds! Five Zoo Friends blocks are full of fascinating details, sounds and motion for wonderful discoveries. And they all store inside when play is done. There's so much to discover with Peek-a-Blocks -- interesting motions, sounds, textures and more. Measures approximately 8.75" x 4" x 13". Requires 2 "LR44" button cell batteries (included).