There is no temperature control. SF Express is a comprehensive express logistics service provider in China, providing logistics services at the delivery end. SF Express Box is marked with SF trademark, and the box shows no temperature control, indicating that the goods have no temperature control. Temperature control refers to cold chain logistics. Generally speaking, it refers to a systematic project that frozen food is always in a specified low-temperature environment in all aspects of production, storage, transportation, sales and consumption to ensure food quality and reduce food losses.