What it is
B21 Pro is a two-inch direct-thermal label maker for labels between 20 and 50mm wide. It prints at 300dpi with an effective print width of 48mm and connects through Bluetooth or USB, allowing NIIMBOT’s mobile and computer software to prepare layouts.
Why the design matters
The vertical body gives the printer a small footprint while leaving the paper exit, side release and front controls visible. The design is wider and more substantial than a pocket label maker because it supports broader labels and a desktop workflow. Its retro-styled shell is not the important distinction; the 300dpi head and 48mm effective width are.
Verified specification record
- Print process: direct thermal
- Resolution: 300dpi
- Effective print width: 48mm
- Label width: 20–50mm
- Print length: 8–200mm
- Maximum speed: 50mm/s
- Paper sensing: gap, transparent, black mark and continuous media
- Connection: Bluetooth and USB
- Dimensions: 130 × 94 × 61mm
- Weight: 322g
- Battery: built-in 1500mAh rechargeable battery
- Charging input: 5V/1A through Type-C, including dual-C cable support
- Operating range: 0–45°C
Labels and software first
NIIMBOT lists automatic paper return and RFID label recognition, but those functions depend on compatible media and the exact software path. A 50mm roll width does not mean every 50mm label layout can use the full width: the effective printable area is 48mm. Before buying consumables, check the roll format, sensing method, label material and whether the current regional application contains the needed language, barcode or template functions.
Battery and wireless record
The manufacturer lists a 1500mAh battery, 5V/1A input and Bluetooth transmission in the 2400–2483.5MHz band with maximum transmit power of 4dBm. Those are specification records, not a battery-life guarantee. Print density, repeated feeds, wireless connection, temperature and standby time affect endurance.
What ChinoMuse has not verified
ChinoMuse has not installed a roll, paired a phone or computer, printed barcodes, measured speed, resolution, battery duration, heat, noise, RFID recognition, adhesive performance or software reliability. Manufacturer feature descriptions remain attributed and should be checked against the exact regional model.
Availability and related records
The official page was active on 9 August 2026. See the NIIMBOT brand profile, compact D110_M and thermal-transfer M2_H.
About this profile
This independent product profile is based on publicly available manufacturer information. ChinoMuse has not physically tested this product. Specifications, software and availability may change; confirm current details with NIIMBOT.
