Exclusive Thermal Ribbons for P831 216mm Portable Thermal Printer - Compatibility: For the P831 216mm portable thermal printer only. Not compatible with HPRT or POLONO MT800 printers. - Media support: Accommodates up to 45 sheets of A4 or US Letter glossy thermal paper, as well as thermal paper and ordinary paper. - Clear, cost-efficient printing: Uses advanced thermal transfer technology to print without ink or toner, reducing printing costs while delivering clear results. Note: Thermal transfer is not recommended for printing portrait photos. - Print capability: Suitable for PDFs, contracts, invoices, web pages, and test papers. Ideal for permanent contracts and important documents. - Easy ribbon loading: The P831 printer uses exclusive thermal ribbon technology; replace only the ribbon. Load correctly by following the arrow instructions. - Storage and durability: Store ribbons at -5°C to 45°C and 20% to 85% relative humidity. Avoid high temperatures and direct sunlight. Ribbon life can be up to 3 years in a dry environment. - Use scenarios: 1) Field service or client meetings: print and sign contracts and receipts on site. 2) Office admin: generate and archive invoices, PDFs, and web pages for records. 3) Education or training: print test papers and worksheets for offline distribution.