It's a headlamp and a projector in one. Set of 4 pieces includes headlamp, adjustable elastic strap, and 2 mini discs of images. Headlamp projects light over 10 feet and images 4-6 feet. Animal-themed mini discs include colorful images of mammals, reptiles and birds. Lightweight design allows for young explorers to play in comfort. Headlamp measures approximately 2.75" L x 2.25" H.