This nixie clock robot used a single tube design that displays the hours and minuts in a 4 digit sequence that repeats. There are also 4 LEDs that can show the digit postion if you like. The robot is a blend of plastic and metal parts that have all been treated to look like a distrested copper finnish. The clock runs on a 9 volt external power pac and the robot bump and go and flashing arm/claw lights run on 2 C cells. The 4 random flashing Leds in the chest guns are ON when ever the clock is in display mod