It sees the near infrared. I expect they got that for free from the camera sensor. https://en.wikipedia.org/wiki/Infrared_photography#Digital_c...:

“Digital camera sensors are inherently sensitive to infrared light, which would interfere with the normal photography by confusing the autofocus calculations or softening the image (because infrared light is focused differently from visible light), or oversaturating the red channel. Also, some clothing is transparent in the infrared, leading to unintended (at least to the manufacturer) uses of video cameras”