A small, helicopter-like drone could be the best defense against an intruder.
Japanese security company Secom has announced that they'll be renting out camera-equipped drones capable detecting intruders, following them and taking their pictures. The drones, which are 24 inches wide and weigh only 3.5 pounds, can accomplish this task automatically or via a dispatcher.
The idea is to let managers of large buildings like factories monitor areas that aren't covered well by conventional security cameras. And even in areas that are covered, a drone can get closer to the action and provide more details.