The light with the bite LED Headlamp. Roars three times when light turned on. Close mouth for ON-OFF. Includes master ON-TEST-OFF switch. Adjustable elastic straps. Super bright white LED powered by 3 replaceable AAA batteries (included). LED protected by focusing lens. Ages 6 and up. Perfect for reading, camping, and safety. 2.8" x 2.7" x 2.9". Weight: 4.2 oz.