The environmental conditions of the cold storage determine the material of the RFID tag. Take oranges, which are relatively easy to break, as a case. Temperature directly affects the breathing intensity of oranges and the speed of bacterial growth. According to this principle, cold storages use low temperature to suppress oranges in the storage. Respiration and the speed of bacterial production and reproduction, but the storage temperature for oranges should not be too low, otherwise it will be subject to freezing damage. Generally, the best preservation temperature for oranges is 3-5 ° C. After the oranges are picked, the relative humidity of the peel is saturated. If the air humidity is lower than the humidity of the peel, the moisture of the peel force will naturally disappear due to transpiration, and the fruit will wither (slang: bran), which will affect the taste and ripeness of the fruit. Degrees, resulting in a difference in fruit sales. Generally, the relative humidity of oranges should be maintained at about 90 to 95%.