NIIMBOT B21 Pro B21PRO-RedBlack 300 DPI Label Maker

Maker: The NIIMBOT B21 Pro B21PRO-RedBlack is a compact thermal label printer listed with Bluetooth and USB connectivity. Its listing claims red-and-black printing and a 300 dpi resolution, with a supplied roll described as 50 x 30 mm red-black labels.

At a glance

The listing describes Bluetooth printing from Android and iOS, plus USB cable connection to a PC using the NIIMBOT computer application.
The NIIMBOT app is described as offering label identification, fonts, borders, symbols, QR-code and OCR printing features.
The product listing claims simultaneous red-and-black output, but that mode requires special label stock.
The listed body dimensions and weight may suit a compact desk or storage setup.

Price

$62.99Save 10%

Reference price: ~~$69.99~~

Price checked: Nov 13, 2026

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Often bought together

Case for NIIMBOT B21/Pro/B1, for SUPVAN T50M Pro Label Maker Accessories | Wireless Thermal Printer Holder, Labeling Tapes Roll Refills Storage, Home/Office Use, Mesh Pocket, Hard Case Only, Beige

$17.99

Pros and cons

Pros

A choice of Bluetooth and USB connections is listed for phone and PC use.
The listing describes app tools for label design and automatic label identification.
A roll of 50 x 30 mm red-black labels is claimed as part of the printer's contents.

Cons

Red-and-black printing depends on special label paper rather than arbitrary thermal labels.
The listing says the computer app is needed for PC use and does not recommend using the printer with a tablet.

Technical specifications

13 specifications

Identity
Brand	NIIMBOT
Model	B21PRO-RedBlack

Printing and media
Printing technology	Thermal
Print resolution	300 x 300
Print media	Labels
Maximum media size	2 INCH
Paper size	1-2 INCH
Ink color	red, black

Connectivity and controls
Wireless connection listed	Bluetooth
Hardware interface	USB
USB ports	1

Dimensions and installation
Dimensions listed	5.12"D x 3.7"W x 2.4"H
Weight listed	11.36 ounces

What to know before buying

Listing details to confirm

The title's 300DPI claim aligns with the listing's 300 x 300 resolution, but the details also say 50 monochrome pages per minute without specifying a usable label-printing speed. Listed paper widths and maximum media size are not fully consistent with the stated 20–50 mm label-width range, so confirm compatible media dimensions before ordering. Red-and-black output requires separately purchasable special labels, and the claimed included roll is specified as 50 x 30 mm. The listing also describes USB PC connection while its connectivity details chiefly identify Bluetooth.

Who is it for?

A good fit for

Home, office or small-business users making labels through a phone app or a USB-connected PC.
Buyers who want app-based label design and may use specialized stock for two-color labels.

Less suited to

People needing ordinary full-size shipping labels or a clearly specified high-speed label-production rate.
Tablet-first users or buyers who expect red-and-black printing on any thermal-label roll.

NIIMBOT B21 Pro B21PRO-RedBlack 300 DPI Label Maker · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 118 ratings

5 stars81%81%
4 stars11%11%
3 stars5%5%
2 stars0%0%
1 star3%3%

Customer feedback describes the printer as easy to use, appealing in appearance and compact. Print quality is mixed, with reports ranging from sharp output to blurry letters. Feedback also varies on feature flexibility and value, including comments about limited customization and expense. Those differences matter if fine text or extensive design control is central to your use. The listing's 300 dpi claim does not establish how consistently labels will look in practice.

Positive themes

Customers describe it as easy to use, cute and compact.

Mixed feedback

Print quality is reported as sharp by some and blurry by others.
Feedback differs on customization options and perceived value.

Frequently asked questions

Does the B21 Pro print in red and black?

The listing claims red-and-black printing. It also says this mode requires special label paper, which can be purchased separately.

Can it connect to a computer?

The listing describes USB cable connection to a PC and says to use the NIIMBOT computer application. It also lists Bluetooth connectivity for Android and iOS.

What label sizes does the listing specify?

It gives a 20–50 mm label-width range, an effective printable width of 48 mm and a longest label length of 200 mm. The details separately state 1-2 INCH paper size and 2 INCH maximum media size, so verify stock dimensions.

Is a label roll included?

The feature listing claims one roll of 50 x 30 mm red-black labels is in the paper bin. Confirm the selected listing's package details before purchase.