There is a growing demand for smart tools and devices that measure visual reaction time during sports and physical activities in outdoor environments. However, one of the major problems is the need to maintain an on-time 1 pulse per second (pps) reference with a known uncertainty. The introduction of ultra-low-power wireless chipsets such as Zigbee technology open new horizons for many new use cases. This paper investigates in-depth the calibration and the reliability of a new wireless

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... sed device for smart modeling of sport practioners interactions and measuring remotely their reaction time. The uncertainty of the calibration is shown to be less than 100 µs.