[8881 AA Battery Box] With AA battery box that can power 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. Power supply kit for high-speed small block motors. Supports forward and reverse. [2.4G Remote Control and Receiver] The motorized system has 4 channel selectors on the remotes and the control. They must be set to the same channel to work. The remote control is powered by 3 AAA batteries (battery not included). [Adapts to Most Block Units] The entire set can basically adapt to most types of block units on the market. [Safety and Learning] Made of high-quality ABS plastic materials. By assembling blocks, children can train their hand-eye coordination, stimulate their hands, and enjoy the joy of doing things. Material: ABS plastic Color: Gray 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 +/- 1-3 cm.