√DC 6V 4-wheel Robot Smart Car Chassis Kits car with Speed Encoder. Recommended for ages 14+. √Uses four deceleration direct current machine curve to be nimble, the directivity is good. Four actuations, horsepower fullness. The chassis big and steady very easy to expand. √ To get hands-on experience about Robotics & Can extend electronics system like Raspberry Pi etc to realize function of tracing, obstacle avoidance, distance testing, speed testing, wireless remote control. √With a car platform, add some micro-controller and sensor modules, and program it. Then you made your own robot car. √Mechanical structure is simple, very easy to insta, ideal for DIY. Couleur:4WD Installation steps: STEP 1: Insert the fastener into hte chassis after tearing off the yellow protection wrap of the chassis,the fastener and the code wheel STEP 2: Install the code wheel and fix the motor to the chassis .(Attention,the copper sheet of the leading wire of the motor should face outward,the same side of the wheel) STEP 3: Fix the motor to the chassis ,then insert and tighten the screws. STEP 4: Insert the screws and fix the battery container. STEP 5: Insert the spacer and tighten the 8 screws to fix the hammer caster.Hold tight and insert the motor(protection fastener) to the wheel . Description: Intelligent car chassis tracing car Robot car chassis with code disk Ideal for DIY This car is the tachometer encoder With a 4 AA battery box and power switch. (Batteries not included.) Can be used for distance measurement, velocity. Can use with other devices to realize function of tracing, obstacle avoidance, distance testing, speed testing, wireless remote control. Package Included: 2 x Car chassis 4 x Gear Motor (1:48) 4x Speed encoder 8x Fasteners Screw