[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).[M Motor 8883 for High-speed] The motor provides strong power.High-speed and small- block motor power supply kit.Support forward and backward.[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).[Adapt to Most Block Devices]The whole set can basically adapt to most type of block Devices in the market.[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.Material:ABS plastic colour:Grey Package Contents: 2 * Medium Motors 1 * Battery Box 1 * Infrared Remote Control 1 * Receiver Only the above package content, other products are not included.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."