[8881 AA Battery Box] With the AA battery box that can power 2 XL motors or 4 M motors at the same time, 6 AA batteries are required (battery 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 selectors on the remote controls and the steering. They must be set to the same channel to work. The remote control is powered by 3 AAA batteries (battery not included). [Adapt to most block units] The entire set can basically be adapted 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 brain, 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 to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.