(As written in the N in-game help)
Sluggish but deadly, these guys need a second or so of charging before firing; use it to run for cover.
Tactics
Laser drones can see any location in a room that isn't blocked by a wall or door. Once they see you, they'll shine a small, harmless ray at you. Get out of the way quickly, because that little ray turns into a deadly laser in about a second. Laser drones aren't too dangerous on their own, but if there are other enemies teaming up against you, things can get hard real fast.
Pictures
Here's a picture of a regular laser drone, before a ninja enters the area:
Here's another picture of the laser drone, this time charging up and trying to fire at the ninja:
In this picture, the laser drone is firing at the ninja, and luckily the ninja's escaped by then:
