NIIMBOT B21 Pro 50 mm - Mobile Label / Receipt Printer

The NIIMBOT B21 Pro Portable Label Printer – Dark Green is a compact thermal label printer designed for home organisation, office filing, and small-business labelling tasks. It uses direct thermal printing, so labels are produced without ink cartridges or carbon ribbons. Print resolution stands at 300 DPI, which is sufficient for clearly legible text and scannable barcodes on labels up to 50 mm wide. The printer operates at a print speed of 60 mm per second, placing it in the mid-range for portable thermal label printers. It supports adhesive label rolls from 20 to 50 mm in width and automatically detects the installed label width, so no manual configuration is needed when switching between tape sizes.

Connectivity is handled through Bluetooth and USB-C, letting users print from both mobile devices and computers. The rechargeable 1,500 mAh battery provides cordless operation, while USB-C charging replenishes the battery when the printer is used at a desk. At 520 g, the printer is light enough to carry in a bag for on-site labelling. The bundled NIIMBOT app runs on Android and iOS and provides 20 built-in fonts for designing labels for storage containers, shelves, cables, and other items. A PC driver enables connection to a Windows computer via USB-C when desktop label design is preferred. Printing is monochrome, producing black text and graphics on white thermal label stock.

• **300 DPI thermal print resolution** – produces sharp text and barcodes on labels up to 50 mm wide.
• **60 mm/sec print speed** – outputs labels at a steady pace suitable for light to moderate labelling volumes.
• **20–50 mm label width support** – handles a range of adhesive label roll sizes, from narrow cable wraps to wider shelf tags.
• **1,500 mAh rechargeable battery** – supports portable labelling sessions without a constant power connection.
• **Automatic label width detection** – recognises installed tape size, so no manual recalibration is needed when switching rolls.
• **Bluetooth + USB-C connectivity** – pairs with Android and iOS phones via the NIIMBOT app or connects to a PC over USB-C.
• **20 built-in fonts in the NIIMBOT app** – offers typographic variety for organising and categorising labelled items.