There are two specs of products,Random delivery A:4r/min B:5/6r/min The look of the product could substitute slightly because of different production batches. But the standard of the product is the same. Product description: This is a synchronous motor, with 2 pin terminals. Low noise. Applications: fan, warmth air blower, electric heaters, burn oven, level lighting fixtures equipment, microwave oven, and different kinds of electric appliances.