Police robots have multiple video cameras that transfer images back to the officers controlling them. There are usually stationary cameras fixed to the robot's body, as well as cameras attached to the it's moving joints. These video systems can make use of black-and-white night vision, as well as infrared technologies. Many police robots have both microphones and speakers, so that police can listen in to what is happening in the robot's environment and communicate with people near the robot. This is particularly useful in hostage situations.
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