Product: CompassMaterial: Zinc Alloy + AcrylicSpecification: 0.9cm*0.368cm*0.116cmIncluding: 1pcs compassScene: outdoor survival; camping; climbing, etc.Instructions for use:1. Talk about placing or holding the compass and use it in a horizontal state to ensure accurate readings (do not place it on an iron table or other places that affect magnetism)2. In order to avoid confusion of pointers, please stay away from objects containing magnetism and current, and some metal products (such as high-voltage lines, mobile phones, stereos, screwdrivers, magnets, etc.)3. Do not knock or pat the compass with your hands, so as not to affect the measurement accuracy.4. Do not leave the compass in the sun for a long time (excessively high or low temperature will affect the life of the compass)5. Keep the shell and mirror smooth and clean, do not wipe with dirty cloth or alcohol.6. When not applicable, please place the compass in a clean, cool place, away from magnetic materials, to avoid consuming the compass magnetism.*Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement. Thanks for your understandings.