Without salesperson and cashiers, the first 24-hour self–service store debuted in China’s Hebei Province. /Photo from Chinanews.cn

After scanning a QR code, customers can open the door and get into the supermarket freely. /Photo from Chinanews.cn

When a customer finished shopping, she or he can put all of the products on a scanning machine, which will automatically list the number of goods and their prices on a screen. /Photo from Chinanews.cn

All the purchase can be paid cashless through online payment applications, such as Alipay and WeChat wallet. After a payment is accomplished through a customer's phone, the guardian system will capture the purchase signal and open the door automatically. /Photo from Chinanews.cn