Material: ABS material Colour: black is given priority to Size: 30 * 85 * 20 mm Net weight: 0. 028 kilograms Functions: 1, whistle 2, refers to the north (south) needle 3, hygrometer (environment temperature know fairly well) Built-in thermometer Temperature measurement range: - 30 to 50 or - 20 to 120 degrees Fahrenheit 4. A magnifying glass (hide) This small whistle and also with the compass, the function of the thermometer, and equipped with hang buckle, can go to the lavatory to hang in his loins, and convenient to carry. In the wild, this a few are very necessary tools, can provide timely help This product is suitable for travel, party, field activities and various competition activities to use.
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