We have developed this IR LED specifically for the Night Master and XSearcher. Being infrared the beam is invisible to humans and animals, but can be seen through a night vision device. Please note that this IR LED has a wavelength of 940nm (works great with most digital and tubed night vision devices). Ideal for closer range work – rats, rabbits, foxes and boar. Max beam (tested with Gen3+ unit) is around 200m.