Related Clues:

• Radar guns, e.g.
• Eye, ear and nose
• Photocells
• Computer data input devices
• Motion detectors
• Security system parts
• ATM parts
• Devices to receive signals or stimuli
• High-tech detectors
• Burglar alarm devices
• Components in smoke detectors
• Devices that detect
• Security system array
• Features of touch-tone phones and A.T.M.s
• They may pick up speed