Hi Torque Gear Motor
The robot car come with 4 wheel high gear torque motor, it make walk more easily on complex ground conditions.
Metal Chassis Omni-directional Mecanum Wheel Robotic Kit for Arduino Tutorials:
Lesson 1: Omni-directional mecanum wheel robot car basic assembly
Lesson 2: Auto obstacle avoidance robot
Lesson 3: Auto tracking Line
Lesson 4: Bluetooth contolled imitation driving
Lesson 5: WiFi controlled robot car