Compatible with Technic Building Blocks Power Functions Kit Includes 2 Motors 1 Battery Box 1 Remote Control for Robot Car Engineering Projects [8881 AA Battery Box]The featuring with AA battery box which can run 2 xl-motors or 4 m-motors at the same time, requires 6 AA batteries (battery not included).<br> [M Motor 8883 for High-speed] The motor provides strong power. High-speed and small- block motor power supply kit. Support forward and backward.<br> [2.4G Remote Control Receiver]The motorized system feature 4 channel selector on remotes and control. They need to be set on the same channel to work .The Remote Control powered by 3 AAA batteries (battery not included).<br> [Adapt to Most Block Devices]The whole set can basically adapt to most type of block Devices in the market.<br> [Safety and Learning ]Made of high-quality ABS plastic materials.By assembling blocks, children can exercise their hand- coordination , stimulate their , and make enjoy the joy of doing things.<br> Material:ABS plastic<br> colour:Grey<br> Package Contents:<br> 2 * Medium Motors<br> 1 * Battery Box<br> 1 * Infrared Remote Control<br> 1 * Receiver<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.