Introduction: The machine working on principle that four orbit fluctuating up and down, it is in possession of feature as follows: attractive appearance，uniformity of operation，quiet, and high capacity .It is widely introduced for projector engineering, Video & TV conferencing system, and Large-conferencing system and so on. Specification 1、Brand name: CHUANGD 2、Model No: G409 3、Put power: AC220V 50HZ 4、Power capacity: 40W 5、Dimension: 660mm*480mm*600mm 6、Loading Capacity: 40kg 7、Traveling:35kg Feature A、Auto-control, easy to ascending & descending B、Uniformity of operation, high stability C、Overall control by using machine independent and central control