The Vex Robotics Design System is a robotic kit intened to introduce students as well as adults to the world of robotics. The Vex Robotics Design System is centered around the Vex Starter Kit (which retails for about USD $300). This kit comes with the Vex "brain" (a microcontroller), a hobby-grade remote control, various sensors (2 bumper sensor and 2 limiter switches), three electric motors and a servo, wheels (4 small, 2 medium all purpose, and 2 large high traction tires), gears, and structural parts. Additional sensors (ultrasonic, line tracking, optical shaft encoder, bumper switches, limit switches, and light sensors), wheels ( small and large omni-directional wheels, small, medium, and large regulars), tank treads, motors, servos, gears (regular and advanced), chain and sprocket sets, extra transmitter and receivers, programming kit (easy C) extra metal and rechargeable battery power packs,can all be purchased separately.