[2 x 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 x 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 for kids]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: picture color Material: ABS plastic The product may have color difference due to different batches Package Contents: 10 x Meduim Moter 5 x Remote control 5 x Lithium battery box 5 x USB charging cable (the color of the data cable is random, don't accept the specified color) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.