3in1 Survival Whistle Mutifunction Lightweight Whistle Thermometer Compass For Camping Hiking And Outdoor Activities Name: 3 to 1 Survival whistle (whistle, thermometer, compass) Function: 1. refers to the North (South) needle (high accuracy, clear at a glance). 2. thermometer (faster and more accurate for the first time to master the current temperature) 3. sides with a thermometer and the other side with a compass. 4., nylon lanyard (more convenient to carry, rope length of about 40cm, hanging on the neck). 5. whistles resounding The weight of goods is about 20g. Commodity length: 63mm Commodity width: around 30mm Mini size, light weight whistle. Excellent for camping, Hiking and outdoor activities. Package Included: 1*whistle