Hotel monitoring is usually kept for 3 months. How long it can be kept depends on the size of the hard disk stored in the installed monitoring system and how many points are installed. Generally, hotels require video recording, which takes 7 days to half a month. The monitoring of food and beverage outlets requires the installation of two cameras, one to monitor the cashier and the other to monitor the gate; The cashier is the place where customers who enter hotels and restaurants pay their bills, and it is also a high-risk area for various disputes; Then the installation and monitoring value of the restaurant checkout counter is very great. At least one ultra-wide-angle panoramic high-definition monitoring camera is installed to look at the whole checkout area and record the overall characteristics of people and materials in and out of the area. The other one can see the amount and face value of the money collected directly according to the position of the till and cashier; The cashier's high-definition monitoring system collects the high-definition image information of the cashier for future investigation and evidence collection; The entrance and exit of hotels and restaurants are crowded and have a large flow, which is inconvenient to manage and easy to cause hidden dangers to the safety of restaurants; Install a high-definition monitoring system at the entrance and exit of the hotel to record the overall characteristics, costumes, faces and details of the materials entering and leaving, and save all the process images.