The product consists of more than 100 pcs 3D printed parts, and the transmission part is composed of caterpillar chain The assembly has been completed at the time of shipment, and the finished products do not need to be assembled manually. You can disassemble and experience DIY assembly by yourself The power interface uses TYPE-C type jack. After connecting the power function, turn on the switch, and the motor starts to work, so the elevator can start to run The up and down modes of the elevator can be switched to each other, which is very interesting. It basically simulates the working state of the real escalator We need to manually assemble these escalator models after making the parts, so in order to ensure that the products are delivered in the first time, the color of the escalator appearance is random. Thank you for your understanding. The speed of the motor is not very high, so although there are external gears that can rotate under the drive of the motor, even touching them will not cause harm to people, and it is still very safe Size: 17.5cm*5.5cm*12.5cm Package：1PC Elevator (random color)