Our car chassis has the following advantages:    1 mechanical structure is simple and very easy to install.    2 car comes with 20 wire tachometer yards, with photoelectric gun shop can be quickly formed a gun systems. You can speed, distance, composed of closed-loop systems.    3 car with four on the 5th battery compartment, convenient to the entire system power supply. At the same time equipped with a switch, easy start-stop system. Without additional very convenient, so that the whole system is highly integrated    4 car shop with L298N driver module, four tracking module, as well as 51 control unit seamless, simple and good-looking components of the system      Shipping list:    Car chassisX1    Car WheelsX 2    DC Gear Motor 1 48: a deceleration DC motor (otherwise 120: 1 Optional)    20 line gun code disk X2    Fasteners (high intensity black acrylic)X 4    Caster X1    Four battery boxX 1    Quality Rocker SwitchX 1    Assembly drawingX 1    Several screw nut    V5 shield X1    UNO R3 X 1    SG90 X 1    FPV X 1    L298N X1