7-IN-1 Functions: Storage Container, Thermometer, 5x Magnifier, Signaling Mirror, White LED Light, Whistle, Compass. 4” long by ¾” wide. Made of plastic. Lanyard Included. Requires 2CR2032 Batteries (Batteries are Included). • Great for Camping, Hiking, Hunting, Fishing, Outdoor Activities, Travel , in Survival Kits etc.