The smart door locks sold in the tens of billions of subsidies for products are genuine, because the smart door locks that participate in the tens of billions of subsidies have to go through the official review of products, and the official review of Apple products will give a certain percentage of subsidies. Usually, they will be given certain subsidies according to the sales price and sales volume of trendy products. In addition to ensuring the authenticity, most of the shops participating in Pinduoduo's tens of billions of subsidies are well-known brands, which can be purchased with confidence.