2WD Smart Robot Car Chassis Kit with Speed Encoder for Arduino Build your own smart robot car with this 2WD robot car chassis kit. Simply add a micro-controller such as Arduino along with compatible sensor modules and programming to create a functional robotic vehicle platform. Features Simple mechanical structure for easy assembly Includes tachometer speed encoder Integrated battery compartment with power switch Convenient system-wide power control Suitable for measuring distance and speed Motor power supply: 3V–6V Parameters tested without load Package Includes 1 x Car Chassis 2 x Gear Motors (1:48) 2 x Speed Encoders 4 x Fasteners 1 x Universal Wheel 1 x Power Button 14 x Screws 1 x Battery Box 10 x Nuts 4WD Robot Smart Car Chassis Kit with Speed Encoder for Arduino Create your own robotic vehicle with this 4WD smart robot car chassis kit. Add a micro-controller such as Arduino and compatible sensor modules to build a programmable smart car platform. Features Simple mechanical structure for easy installation Includes tachometer speed encoder Four geared DC motors for flexible movement and good directional control 4-wheel drive design with strong power output Large and stable chassis for easy expansion Package Includes 2 x Car Chassis 4 x Gear Motors (1:48) 4 x Speed Encoders 8 x Fasteners 1 x Power Button Screws