Description: This Heliograph Signal Rescue Mirror With Whistle is a great tool during any emergency situation. A heliograph is essentially a mirror, usually using Morse code, using sunlight to flicker information in the distance. They were widely used for military and survey purposes in the 19th and early 20th centuries, and now you can own your very own! This 4-inch metal Heliograph is light and strong, made of metal, and not easy to break.
Suitable for all kinds of environments, with a built-in precision aiming system, this tool will be the perfect addition for your outdoor adventures, and it can also be used normally on cloudy days or nights with artificial lights as well.
- Material: acrylic.
- Color: show as pictures.
- Size: 2 x 2 in (57 * 57mm)