Sort, stack and drop! As this simple task is repeated, shape matching and identification are learned. When the object hits the bottom, your pre-recorded message will play (up to 20 seconds). Remove the sorting lid and larger objects can be used for simply putting in and taking out. You can adjust the sensitivity to accommodate items of differing weights. (Very lightweight items made of a soft material, such as a cottonball, will not activate the message and lights). Comes with 3 blocks; 1 round, 1 square and 1 triangle. Size: 6¼" x 6¾". Requires 4 AA Batteries