The Invisible Laser Cameras were an invention in The Christopher Show.
The Invisible Laser Cameras were probably by far the most featured of Danny's inventions on the show. They were most seen in the earlier seasons such as Season 1 and Season 2, and were a major plot device in Episode 5: Spy Fly when Chris had to dodge the lasers to get to Danny's Lair. However, they appeared in most of the seasons from seasons 1-9. They have become sort of like a running gag in the series (up until Season 9, when Danny stopped making inventions.)
The cameras were invisible and were in every corner of the house, attached to the ceiling. They shot lasers and were remotely controlled by Danny from his lair.