This Doctor Who desktop patrol Dalek patrols your desktop for hours never falling off or bumping into anything! Simply turn on the 4-inch Dalek and place it on your desktop (or other flat surface). The robot has built-in sensors that detect the ground in front of it and will turn away from the edge of the desk or any object hence continually patrol your desktop! At each and every turn the Dalek says Exterminate . This function can be optionally turned off if your prefer for your desktop to be patrolled in silence. Requires 3 X AAA 1.5V batteries (batteries not included).