[Battery Box]The power system featuring with AA battery box which can run 2 xl-motors or 4 m-motors at the same time, requires 6 AA batteries (not included). [M Motor for High-speed] The motor provides strong power. High-speed building block motor power supply kit. Support forward and backward. [Switch and Light Cable] Include a switch and cable that allow you to stack the switch and light connectors on the battery pack. This lets you have lights on and still be to turn the motor on or off separately [Adapt to Most Building Block Devices]The whole set can basically adapt to most type of building block Devices 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. The color of the LED light line is random and cannot be Material:ABS plastic colour:Gray Package Contents: 1 x Medium Motors 1 x Battery Box 1 x LED Light Cable 1 x Switch Only the above package content, other products are not included. Note: Light 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.