Portable for Business Trips: Each thermal ribbon can support 45 sheets of letter paper or A4 paper. With their compact and lightweight size, they are easy to carry during travel, making them a helpful tool for your work and studies. The simple replacement steps save time and ensure continuous printing. Proper Storage: The exclusive thermal ribbons should be stored in a temperature range of -5°C to 45°C and a relative humidity range of 20% to 85%. Avoid exposing them to high temperatures and direct sunlight. They can be stored for up to 3 years. It is important to keep the exclusive thermal ribbons in a dry environment. Easy to Use: The Phomemo P831 portable printer uses exclusive thermal ribbon technology, eliminating the need for ink and only requiring the replacement of the thermal ribbon. Simply follow the arrow instructions to load the ribbon correctly and smoothly. Clear Printing: Featuring advanced thermal transfer printing technology, these ribbons can reduce printing costs and ensure clear printing content without the need for additional ink and toner. They support printing of PDF files, contracts, invoices, web pages, and test papers, making them suitable for permanent contracts and important documents. (Note: Thermal transfer technology is not recommended for printing portrait photos.). Exclusive Ribbons: The thermal ribbons are Only compatible with the Phomemo P831 216mm portable thermal printer. They support 45 sheets of A4 or US Letter glossy thermal paper, thermal paper, and ordinary paper. With strong compatibility with the P831 Printer, you can purchase thermal ribbons according to your needs for high-quality and long-lasting prints (Note: Not compatible with HPRT, POLONO MT800 Printer).