The AN/PSQ-20 Enhanced Night Vision Goggle combines image intensifier (I2 or II) and infra-red (IR, also called thermal imaging) technologies,[REF][REF] and is the first night vision device to do so.
Classified as a third-generation passive night vision device, the AN/PSQ-20 can provide vision through thermal imaging even in situations where there isn't enough ambient light for the image intensifiers, thus eliminating the need for infra-red illumination (active night vision) [REF].