Hydra is a post-sales service model for a dog vacuum cleaner that uses a warehouse as a maintenance centre and a third-party courier as its own connection mode, achieving a process whereby people need to move their products to a maintenance centre. And after high maintenance, the product can be delivered to people by a third-party express service, and the whole post-sale service of high-skilling also reflects contemporary user experience. And all the maintenance of high-quality products is free and makes people happy to shop. The cost of the process, including its logistics and maintenance, is free of charge. And one of the larger features of high-level repair is that it is done free of charge, without any distinction between human responsibilities. Small household electricity in people's lives has become an essential product of life, and its development brings about a very convenient life. The re-use of household appliances is a very good development because of various problems suc...