• The elevator is a kind of vertical elevator powered by a motor, equipped with a box-shaped pod, used for multi-storey buildings to take people or carry goods. There is also a stepped type, the stepper is installed on the track to run continuously, commonly known as the escalator or moving walk. Fixed lifting equipment serving the specified floors. The vertical elevator has a car that runs between at least two rows of vertical or rigid guide track with an inclination angle of less than 15°. The size and structure of the car are convenient for passengers to enter and exit or load and unload goods. It is customary to regard elevators as the general term for vertical transportation vehicles in buildings regardless of their driving methods. According to the speed, it can be divided into low-speed elevators (below 1 m/s), fast elevators (1 to 2 m/s) and high-speed elevators (above 2 m/s).

As a STEM kits supplier, we have produced and tested thousands of science kits in the past years. As our marketing feedback, the crossing alarm is one of the popular kits. It's a electric experiment. We need to use the metal picks to cross the road, but it is made of wires. When cross the road, if the picks touch the wires, the alarm will open. In addition to learning electricity knowledge, this experiment can also exercise children's balance and control.

1.It can train and develop the children's differnt abilities in all aspects, such as intelligence development, hands-on brain training, interest cultivation and parent-child interaction. 2.It has a beautiful shape, which is easy and simple for us to install and make it, especially for low grade children. 3.It is made by environmentally friendly materials. It is suitable for school science invention homework, which will make the students experience the joy of production and understand the little knowledge of scientific circuit in their brain.