This survival whistle is great for camping, hiking, hunting, fishing, outdoor activities, travel, emergency kits, survival kits, etc. Lightweight and compact—our whistle can easily fit inside your pocket, backpack, survival pack, purse, etc. for easy storage and transportation, and can hang onto your neck, wrist, gear, etc. with the lanyard. Storage Container Thermometer 5x Magnifier Signaling Mirror White LED Light Whistle Compass Length: 4” Diameter: 3/4” Plastic Body Lanyard Included Requires 2CR2032 Batteries (Batteries are Included)