Application This product is widely applicable in such occasions as easily combustible, explosive, corrosive, acid, alkali, plating, and mixture gas. Technical characteristics Trinity-drive system: the electric appliance adjusts speed without contact or spark module, and fulfills converter function, including mini-speed and double-speed, which makes traveling and lifting very steady; it is equipped with such protection devices as alarm device to overloading, obliquely hanging, second protecting preventing hook clashing the top, protecting the current lacking of any phrase etc. The operation board adopts 12V safe voltage to fulfill multi-function of protection to hoist. The electric controlling can be used more than 2 million times when the voltage is 380V+5 ~10%.