Roinco Smart car 4WD chassis is best for beginners as well as regular users. This Kit is easy to use as it have all the mounting hole and assembly. This smart car chassis come with battery holder for providing power to bo motor. It has an exact same size mounting hole for Arduino and raspberry Pi (Arduino and Raspberry Pi Board not included in Kit) Common Items to be included – MDF Base Chassis - 1 Pcs Bo motor - 4 Pcs Battery Holder 6XAA - 1 Pcs Robotic Wheel - 4 Pcs M2.5x25 screws - 8 Pcs NOTE: The kit requires assembling and you may need an additional screwdriver to set the screws and nuts together. Remember, the fun begins with assembling.