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In addition, it can emit sound waves or wait for the reception of a sound wave, which then triggers a program. For example, students can construct a traffic monitoring system, measure distances, and discover how this technology is applied in everyday objects – such as vacuum robots, cars, and manufacturing plants. It measures distances between 3 and 250 cm (1 to 100 inches). Measurement accuracy: +/- 1 cm (0.394 inches). It lights up continuously when sending and blinks when receiving. It returns the value "true" upon detecting another ultrasonic signal. The EV3 software automatically recognizes the connected sensor.