Upon closer inspection however a small lens at the position of 12 o' clock on the watch face indicated the mode of the wireless data transmission through visible light.[4][16] Data was transmitted from the CRT of the computer through a series of pulsating horizontal bars,[17][18] that were then focused by the tiny lens and inputted into the watch EEPROM memory through an optoelectronic transducer operating in the visible light spectrum and employing optical scanning technology.[19][20]
The CRT synchronization was possible only for systems operating on Windows 95 and Windows 98. The watch was compatible with Schedule+ and for the Datalink 70 model the time needed to download seventy phone numbers was about twenty seconds.[14][17]
http://en.wikipedia.org/wiki/Timex_Datalink#Optical_sensor
Upon closer inspection however a small lens at the position of 12 o' clock on the watch face indicated the mode of the wireless data transmission through visible light.[4][16] Data was transmitted from the CRT of the computer through a series of pulsating horizontal bars,[17][18] that were then focused by the tiny lens and inputted into the watch EEPROM memory through an optoelectronic transducer operating in the visible light spectrum and employing optical scanning technology.[19][20] The CRT synchronization was possible only for systems operating on Windows 95 and Windows 98. The watch was compatible with Schedule+ and for the Datalink 70 model the time needed to download seventy phone numbers was about twenty seconds.[14][17]