* Equipped with two modes of no-load in high-speed and with-load in low-speed to achieve automatic switch-over for travel with-load in high-speed, overload travel protection function, to ensure the safety for travel with-load.

* Automatic direction change function of forward/ backward travel, without changing steering direction, so as to make operation more humanization.

* Use of mixed luffing down technology, to ensure not only smooth gravity falling but also fast dynamic falling, for energy-saving, stable, fast and efficient operation.