[8881 AA Battery Box] It has an AA battery box that can power 2 XL motors or 4 M motors simultaneously, requires 6 AA batteries (batteries not included). [M motor 8883 for high speed] The motor provides strong power. High speed and low torque building block motor power supply kit. Supports forward and reverse. [2.4G Remote Control & Receiver] The motorized system has 4 channel selections on the remote controls and the steering. They must be set to the same channel to work together. 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 for Children] Made of high-quality ABS plastic materials. By assembling building blocks, children can exercise their hand-brain coordination ability, stimulate their imagination, and let them 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 to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.