AA Battery Box: Features an AA battery box that can run 2 XL-motors or 4 M-motors simultaneously. Requires 6 AA batteries (batteries not included). M Motor for High-Speed: Provides strong power. This is a high-speed, small-torque building block motor power supply kit. Supports forward and backward operation. Infrared Remote Control and Receiver: The motorized system features a 4-channel selector on the remote for control. The remote and receiver must be set to the same channel to operate together. The remote control is powered by 3 AAA batteries (batteries not included). Adapt to Most Building Block Devices: This set is compatible with most types of building block devices on the market. Ideal for Learning: Made of ABS plastic materials. By assembling building blocks, children can exercise their hand-brain coordination and stimulate their imagination. Material: ABS Plastic Color: Grey Package Contents: 2 x Medium Motors 1 x Battery Box 1 x Infrared Remote Control 1 x Receiver Only the above package content is included; other products are not included.