Robots are increasingly replacing humans in a variety of mundane tasks, like bolting a car together or making lollipops, but now they are moving into the security business. Microsoft recently installed a fleet of 5-feet-tall, 300-pound robots to protect its Silicon Valley campus. The robots are packed with HD security cameras and sensors to take in their organic, protein-based surroundings. Theres also an artificial intelligence on board that can sound alarms when the robot notices something awry. It can also read license plates and cross-reference them to see if theyre stolen.

The K5 robots come from a California company called Knightscope, which calls the robotsautonomous data machines that provide acommanding but friendly presence. Sounds like something a robot manufacturer would say. The K5 robots dont have any weapons on them. All they can do is assess a situation, sound an alarm to defuse it, or call a human security officer to the scene. There are, however, plans equip the robots with tasers sometime in the future.

Microsofts new protectors are fairly autonomous. A single charge will last 24 hours, and if the robot notices that its battery is getting low, it will return to a charging port and plug itself in. It can fully recharge in 20 minutes. There are plans to one day expand the use of Knightscopes robots and have them patrol the streets as part of human police units.