Make sure your decals and Uv Liquid still glow brilliantly for wild birds WindowAlert decals and WindowAlert UV liquid have a coating that brilliantly reflects ultraviolet sunlight Features . Window Alert UV Flashlight Tester. For Testing UV Liquid and Decals. 365 Nanometer LED UV Black Light Flashlight. Uses 4 AAA Batteries Specifications . Dimension 4 H x 1 25 W x 1 25 L