PTZ cameras can move left/right (pan) or up/down (tilt). Most PTZ security cameras have optical zoom capabilities as well, allowing them to zoom in & deliver greater detail from farther away. PTZ cameras can be controlled remotely, using a keyboard or joystick, or a mouse via a security DVR. Some PTZ security cameras can even be programmed to patrol between several pre-determined locations automatically. Sometimes external triggers, such as motion or door contacts, can cause the camera to reposition itself as well.