This power system includes an AA battery box that can power two XL motors or four M motors simultaneously. It requires six AA batteries (not included). The M Motor 8883 offers strong, high-speed, and small-torque power for building blocks. It supports forward and backward motion. The motorized system features a 2.4G remote control and receiver with a four-channel selector. They must be set to the same channel to function. The remote control requires three AAA batteries (not included). This set is compatible with most building block devices available. Children can enhance their hand-brain coordination and stimulate their imagination through building block assembly, fostering a sense of accomplishment. Made of ABS plastic. Color: Grey Package Contents: 2 * Medium Motors 1 * Battery Box 1 * Infrared Remote Control 1 * Receiver Only the above package contents are included; other products are not. Note: Lighting and different display settings may cause the item's color in the image to slightly differ from the actual product. The measurement error allowed is +/- 1-3cm.