Fangrui Product Details [2*m Motors For High-speed] The Motor Provides Strong Power. High-speed And Medium-torque Building Block Motor Power Supply Kit. Support Forward And Backward. [remote Control App Control]there Is Bluetooth Remote Control.support The Technic Parts Foward /backward /left /right. Reserve Swithching Betwwen Positive And Negative. You Can Also Download The App To Control. The Remote Control Needs 2*aaa Power Supply (not Included). [4-terminal Master]this 4-channel Masterfeature With 7.4v Output,500ma Battery Capacity And 4 Motor Output Ports. [adapt To Most Building Block Cars]the Whole Set Can Basically Adapt To Most Type Of Building Block Car In The Market. [safety And Learning ]made Of High-quality Abs Plastic Materials.by Assembling Building Blocks, Children Can Exercise Their Hand-brain Coordination Ability, Stimulate Their Imagination, And Make Them Enjoy The Joy Of Doing Things. Colour: Black+gray+orange+white Material: Abs Package Contents: 1 X Building Blocks Power Kit Only The Above Package Cont