OBSERVERS USE: This one mode blue light flashlight is professionally designed for night activities observers. if you use the white light, animals will hide from you, you are not able to watch their natural behavior at night; animals eyes are not sensitive to blue light, so this blue light is very useful to find the animals in the dark, like hogs, coyotes, fox, turtles, snakes, and reptiles. MULTIFUNCTION USE: this blue light torch is IPX44, it can survive accidental drops, temporary water resistance, and perform reliably under any condition. The blue light can be powered for hours with 2 standard AAA batteries. (Batteries are NOT included). DURABLE ALUMINUM DESIGN: This blue light has a metal clip on the body, convenient for you to clip it in belts, pockets, school bags and more to take out, proper for cycling, astronomy, aviation, night observation, hiking, camping, fishing, riding, emergency use and other outdoor activities SIMPLE OPERATION: It is only one mode with tail on/off switch, it is helpful when one-handed operation when use for hunting, fishing, and also great for safety, signaling 2 x Blue light Pocket Pen Flashlight. Batteries not included