(1) About proofing   The transformer is a customized product, please provide product specifications or samples, we will make samples for you according to your needs   2. About the unit price   Transformer is a custom product, even if the same model of the product unit price are not the same, the specific price depends on the parameters of your product and the complexity of the process, please provide the parameters and process requirements of the product when the inquiry, the two sides determine the order price before placing an order.