Explore unknown areas, measure distances, follow trails, show directions of travel by means of blinking signals, recognize colors, measure temperatures, avoid obstacles without touching them, recognize day and night, turn headlights on and off automatically and trigger an alarm etc. The ROBOTICS TXT Explorer sensors can do all of this and lots more. More specifically this includes: The NTC resistor, the photoresistor, the ultrasonic distance sensor, the optical color sensor and the specially developed infrared trail sensor. Thanks to two encoder motors and the crawler drive even almost impassable terrain can be explored and traveled on. With the rescue robot, which is contained as a model, the construction set provides the ideal basis for participation in the RoboCupJunior.