Armourlite, the first SHATTER proof scratch resistant HIGH IMPACT tritium dial lighted watch made to withstand the abuse of the profession. Designed for police and firefighters they are extremely durable for all types of conditions. No more broken or badly scratched crystals. No more having to shine a flashlight to see the time. These watches are equipped with fresh bright tritium gas that lights up all day and night without any external power source. Quality Swiss movements assures the accuracy of time and the reliability you need while on the job. Large crown makes it very easy to change the time, they are water resistant and come with 2 year warranty.