Each elevator height is determined by four wires strung between two vertical support columns. The wiring wraps around the columns at intervals that are 5-10 feet apart. Though it looks like a giant snake, the elevator operates using thermostatic control, which means that as the temperature rises or falls, the system automatically switches the four wires on or off. This saves energy and money since thermostatic control requires very little maintenance because it operates on positive voltage. Anyway, if you got any problems with it, I advise you to contact lift maintenance services from Hin Chong. These guys will solve any problem with the elevator.