8881 AA Battery BoxThe 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 and ReceiverThe motorized system feature 4 channel selector on remotes and control. They need to be set on the same channel to work together.The Remote Control powered by 3 AAA batteries (battery not included). Adapt to Most Block DevicesThe whole set can basically adapt to most type of block Devices in the market. Safety and Learning Made of 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 picture a little different from the real thing. The measurement allowed error is 1-3cm.