Pan-tilt-zoom (PTZ) cameras have parts that allow them to rotate left to right, tilt up and down, and zoom in and out. They are considered the most viable option for videoconferencing in meeting rooms and where high image quality is required, regardless of the conditions. These cameras do not compress the image and transmit it without delay to the frame grabber or to a videoconferencing terminal. They also have a rotating device that allows the camera to be aimed in the direction of the speaker. The only disadvantage of PTZ cameras is their high cost, but this is justified by their versatility. Virtually all PTZ cameras can be controlled by remote control, joystick or the mouse at the remote site. They can also record certain pre-programmed positions and focus on them in a fraction of a second.