German inventor Walter Bruch used live video recording in 1942. During WWII, early CCTV was used to watch V-2 missiles. CCTV was less effective compared to now. Live tracking was provided rather than automated sensors, infrared cameras, and body temperature detection, with no recording option. Today's CCTV can do practically anything. Mobile devices can get real-time field updates from solar-powered wireless CCTV towers.