Elego UNO Project Smart Robot Car Kit with Four-wheel Drives, UNO R3, Link Tracking Module, Ultrasonic Sensor, Bluetooth module, Remote, ect. Newest Intelligent and Educational Toy Car for Kids - Neuroscience News
The most economical and newest robot car kit with simple mechanical structure, a nice system and very easy to install. CD with the best tutorial including the video which bring you to the robot car world . there is a ultrasonic sensor to keep the car way from barrier.