The Temperature Cubelet contains a tiny thermometer (actually, a thermistor) that detects temperature. It’s calibrated to output a 0 in freezing conditions and 255 in hot, sunny conditions of about 35C.
Cubelets are magnetic blocks that can be snapped together to make an endless variety of robots. You can build robots that drive around on a tabletop, respond to light, sound, and temperature, and have surprisingly lifelike behavior. But instead of programming that behavior, you snap the cubelets together and watch the behavior emerge like with a flock of birds or a swarm of bees.
Note: Cubelets require a special battery and charger. You will need to purchase the charger separately.