Add this high quality UV Flashlight to your geocaching bag. The 395nm wavelength output by this UV flashlight is ideal for geocaching, fishing and other UV applications. Waterproof to IPX8 standard. Something every cacher that carries a trail GPSr can appreciate is that this UV Flashlight uses AA batteries. With this UV Flashlight you are now able to standardize all of your batteries on AA. Use the same batteries in your GPSr, your flashlights and your UV flashlight.