With the EF-30A-3 you can be seen from the air anywhere within 10 square miles at night and visible over a mile in daylight. Lightweight, compact and high quality, this extremely long range strobe is built to the highest professional standards by SAR veterans. Because it is visible in all directions it does not have to be held or aimed like a flashlight. With other strobes they have to get much closer to see you lessening your chance of being seen. United States Coast Guard Certified 161.012/108/0 under safety, search and rescue.