Timex/Microsoft Datalink watch
Sounds a bit like the Timex/Microsoft Datalink watch from 1994, where a series of flashing horizontal lines on a CRT monitor were sensed by an optical sensor on the watch.
Sounds a bit like the Timex/Microsoft Datalink watch from 1994, where a series of flashing horizontal lines on a CRT monitor were sensed by an optical sensor on the watch.