4wd Smart Robot Car Chassis Kits With Speed Encoder for Arduino

Specifications:Material:Stainless steel+ABS plastic+BrassWheel diameter:about 6cmFloor thickness:about 3mmCar length:about 25cmCar width: about 14.8cmFeatures:-This 4WD Car Chassis Kit-Mechanical structure is simple,it is easy to assemble.-With a 4 AA battery box (Batteries not included.)-This car is the tachometer encoder.-Can use with other devices to realize function of tracing- obstacle avoidance- distance testing- speed testing- wireless remote control-Instruction Assembly - Not includedPackage includes:2 x Car Chassis4 x Gear Motor 1:484 x Car Tire4 x Speed Encoder8 x Fastener1 x Battery Box (Batteries not included )All Necessary Screw And Nut