... lamp,Christmas tree,Rotating electric Advertisements and shelves,etc.3) Electric machinery:Vending machine,automatic electric instruments And meters, ... antenna,etc.4) Scientiific and teching devices:Rotating electric models,Electric curtains,etc.5) Medical equipments:Stirrer,pump,etc ... .6) Industrial area:Electric transit instrument,etc. 2.Feature:1) Stable speed2) ...