4 1/2" closed. 7-function, multi-use optical pocket tool that contains a 30x power microscope, 8x power telescope, 9x power fold-out magnifier, LED flashlight, signal whistle, directional compass and digital clock. Compact, lightweight and easy to use. Winner of the "Creative Child Magazine 2007 Top Toy of the Year Award". Weighs 1.9 oz. Hang packaged.