The Olight blue filter creates a soft blue light that provides a less disturbing light, good for navigation and map reading. Hunters use the blue filter to track wounded game at night because blood stands out more distinctly against foliage when viewed under blue light. Provides more light than other filter choices while still reducing light output for tactical applications. High quality TPU body construction offers flexibility, durability, chemical, and abrasion resistance. The lens features a top quality anti-reflective coating on both sides for optimum light transmission. It also includes a lanyard loop for portable convenience.