New design with skull buster! These Mini Trip Alarm Devices are the perfect gift for the outdoor enthusiast, survivalist, or camper. Perfect for those who want something small and easy to carry. Don't let the size scare you away! These are super loud when used with 209 primers and super easy to use. Made completely of rustproof high-quality materials and built to last many uses. Only 4-1/4″ long X 9/16″ in circumference and weighs only 32 grams!