[2*M Motors for High Speed] The motor provides strong power. High speed and medium-torque building block motor power supply kit. Supports forward and reverse. [Remote Control & APP Control] Features Bluetooth remote control. Supports forward/backward/left/right movement of the technical parts. Reserved switching between positive and negative. You can also download the APP for control. The remote control requires 2*AAA power supply (not included). [4-Terminal Master] This 4-channel master functions with 7.4V output, 500MA battery capacity, and 4 motor output ports. [Adapts to Most Building Block Cars] The entire set can be adapted to most types of building block cars on 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 enjoy the joy of creating.