Item description: T10 multifunction compass Size:80 x40x25mm Material:ABS plastic etc. Packing:Plain carton or cloth packing there is an extra yuan for the cloth packing Weight:About 70 grams per carton Color:There's army green and orange  Function:1, whistling 2-3. Call for help in the field of firestone, and send out sound signal (use the piece push rod to push out the whistle from the hole) 5. Look for coordinates on the magnifying glass map 6. Measuring distance with ruler 7, the field mirror for help, reflection of sunlight, send out light signal 8. Horizontal mirror measures the level Magnetic azimuth Angle measured by compass (this compass has the function of looking down, looking up and reading 11. A thermometer measures the ambient temperature 12. LED lighting (battery can be replaced, take out the magnifying glass ruler and unscrew three screws to replace the battery)