LEDs mounted on a small circuit board stuck to the lamp shoot invisible infrared light into his pupils.
LEDs mounted on a small circuit board stuck to the lamp shoot invisible infrared light into his pupils.
灯具上黏著一小块电路板，电路板上贴著发光二极体。
LEDs mounted on a small circuit board stuck to the lamp shoot invisible infrared light into his pupils.
灯具上黏著一小块电路板，电路板上贴著发光二极体。