[8881 AA Battery Box] It has an AA battery box that can power 2 xl motors or 4 m motors at the same time, requires 6 AA batteries (batteries not included). [M Motor 8883 for high speed] The motor provides strong power. High speed and small block motor power supply kit. Supports forward and reverse. [2.4G Remote Control Receiver] The motorized system has 4 channel selections on the remote control and steering. They must be set to the same channel to work. The remote control is powered by 3 AAA batteries (batteries not included). [Adapts to most building blocks] The entire set can basically be adapted to most types of building blocks on the market. [Safety and learning] Made of high-quality ABS plastic materials. By assembling building blocks, children can train their hand-eye coordination, stimulate their imagination and enjoy the joy of creating 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 to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.