C541 Conversation(part Ii)

"What about the night vision goggles?" Henry said, "Turn on the night vision goggles. There's a button at the front that can adjust the focal length."

Zhang Youbin put down his night vision goggles. He used his right eye to observe the situation on the other side. The frontmost knob was turned.

Seeing the object in front of him being pulled closer and closer and focusing automatically