The Dcode DC421 Pro is a 4-inch thermal transfer/direct thermal label printer with a 203 DPI resolution, capable of printing at a maximum speed of 5 inches per second and a maximum print width of 4.09 inches (104mm). It features 8MB of Flash Memory and 8MB of SDRAM, expandable up to 4GB, and supports various media types and label formats, including continuous rolls, gaps, black marks, and fan-fold. 

Key Features and Specifications:

• Print Technology: Thermal Transfer and Direct Thermal
• Resolution: 203 DPI
• Print Speed: Up to 5 inches per second (127 mm/sec)
• Maximum Print Width: 4.09 inches (104 mm)
• Memory: 8MB Flash Memory, 8MB SDRAM (expandable up to 4GB)
• Media Types Supported: Continuous rolls, gaps, black marks, fan-fold, punched holes
• Label Width Range: 1 inch to 4.6 inches (25.4 mm to 118 mm)
• Connectivity: USB
• Barcode Compatibility: 1D and 2D barcodes (Code 39, Code 93, QR code, etc.)
• Sensors: Gap sensor, ribbon sensor, black mark sensor, cover open sensor 

Additional Notes:

• The Dcode DC421 Pro is designed for applications requiring accurate and reliable label printing, such as barcoding, shipping labels, and product labeling. 
• The printer's versatile media handling capabilities and high-speed printing make it suitable for various labeling tasks. 
• The device's memory and sensors contribute to efficient and accurate label printing.