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Li-Po battery level
loudspeaker
microphone
infrared remote
control receiver
3-axis accelerometer
5 proximity sensors
obstacle detection
2 ground sensors
line following
39 LED
visualize sensors
reset button
5 capacitive touch buttons
activity display
and ON-OFF function
pencil support
USB connection
programming and recharging
memory card slot
hook for trailer
2 proximity sensors
mechanic attachment
2 wheels
speed control
temperature sensor
and interactions
sensors actuators support