No charge. Sanmen County belongs to Taizhou City, Zhejiang Province, and is located in the northeast coast of Taizhou City, Zhejiang Province. There is no charge for 24-hour self-help books in Sanmen County, and 24-hour self-service library is a new library integrating intelligence and humanities. It is "equality, openness and freedom". Readers with Sanmen County library card and registered ID card can enter self-service library with their ID card and complete the borrowing and returning procedures on self-service equipment.