It ain't over until the watch vibrates
The manufacturer of the watch being used and the transmission rate and protocols have not been disclosed by GoalControl, apparently for confidential and security reasons. However, EE Times has learned that the device was designed in collaboration with the Fraunhofer Institute fir Integrated Circuits (Erlangen, Germany) and is based on a Texas Instruments watch powered by a chip set from the chip maker. It uses the Fraunhofer group's patented software and protocol. The FIFA approved device operate in the frequency ranges 865 to 870MHz and 915 to 930MHz.