Main Features:This Motor Smart Car Kit is a best Robot learning tutorialMotor power supply is 3V-12VAll the parameter above is tested without loadThis smart car has functions include tracing， obstacle avoidance， distance testing， speed testing， wireless remote， etc.This is a complete motor smart car kit， all you need to do is to finish it by starting from one partGear motor deceleration indicatorChassis made from acrylic materialWith installation holes， easy to useGreat for DIY project Features: Educational Package weight: 0.695 kg Product Size (L x W x H) : 25.5 x 15x 6.5 cm / 10.0 x 5.9 x 2.6 inches Package Size (L x W x H) : 27.5 x 17 x 5 cm Package Contents: 2 x Smart car chassis， 4 x Motor wheels， 4 x Speed measuring code discs， 8 x Fasteners， 1 x Installation drawing， 1 x Power supply box， 1 x Screws pack