1. A finish line sensor device comprising: a) a first electronic component, said first electronic component comprising: i) a processor with a timing clock, ii) a user interface to interact with the processor, iii) a prompting device, said prompting device at least one selected from: a sound emitting device, a vibrating device, a light emitting device and a display device, iv) memory, having program steps stored therein to control the processor, said programming steps including instructions to begin a countdown timer when activated by the user interface, to prompt a user by the prompting device, and to store a starting time and an elapsed time, to receive an electronic communication from a second electronic component, said communication including a first time synchronization and a second time of the user passing a finish line, and a calculation step to calculate the time from the starting time to the time the user passes the finish line, v) a communication port to send data and commands to and from the processor b) the second electronic component comprising: i) a processor with a timing clock, ii) a communication port to send data and commands to and from the processor, iii) a radar transducer configured to transmit a radar signal, receive a reflected radar signal and provide a digitized signal of the radar signal to the processor in the second electronic component, iv) memory, having digitized data and program steps stored therein to control the processor, wherein the program steps include instructions to compare the intensity of a reflected digitized radar signal with a pre-selected value and when the pre-selected value is exceeded to send the electronic communication to the first electronic component, said communication including the first time synchronization, to store the digitized radar signal after the first synchronization time, and, to analyze the digitized radar signal for a return to a baseline value and at that time record a baseline time, and analyze the stored digitized radar signal to detect a finish time between the first synchronization time and the return to a baseline time and send a communication to the first electronic component of the time of the finish time, wherein the first electronic component is located at a starting point and the second electronic component is located at a finish line.