The Princeton Tec Meridian Strobe/Beacon Dive Light is a powerful beacon that can be seen up to a mile away. This dive light is waterproof, the IPX8 standard depth of 100 meters., and will run for 100 hours before needing a new battery. Able to toggle between red and white light modes, this beacon can be used to keep track of one another underwater, on the surface, or in an emergency it'll be much easier to locate one another. This beacon can be easily attached to any of your gear or your body with a strap of up to 1 inch wide. Armband is included.