A hockey puck is disclosed including an internal signal transmitter enabling instantaneous identification of its position as it moves around. The puck includes two molded subcomponents, which encapsulate the signal transmitter. The signal transmitter may include driver electronics and a number of signal transmitters which together generate and emit an electromagnetic signal. The electromagnetic signal may be emitted by a plurality of diodes mounted in cavities in the subcomponents, for example around an outer circumference of the hockey puck and through a top and bottom surfaces of the hockey puck. The puck may alternatively be formed of a material that allows electromagnetic radiation to be emitted through the subcomponents, and the diode cavities may be omitted.