SunFounder Remote Control Robot Smart Car Kit V2.0 for Arduino Uno R3 Ultrasonic Line Follower Sensor IR Receiver A complete robot kit based on Arduino - for better learning, an elaborately-written user manual, detailed assembly tutorials, and schematic diagrams are provided. With the sample sketches provided, you can control the car remotely via IR module, and make it follow lines, track hand and avoid obstacle. Many I/O ports reserved on the Sensor Shield for you to install more sensors for function extension. Gives interesting experience of assembly  you can really build a robot from scratch and make it move as you want, which is great achievement! Working Voltage: 7V-12V; Size: 280 x 153 x 83mm; Powered by two 18650 rechargeable lithium batteries