1. Introducció
The Niimbot B21 Pro is a versatile smart label printer designed for both home and commercial use. It features 300dpi high-definition thermal printing, eliminating the need for ink, toner, or carbon tape. With wireless Bluetooth connectivity, it supports printing from both mobile devices (iOS and Android) and PCs, offering a wide range of templates and customization options through the dedicated NIIMBOT app.
2. Contingut del paquet
Marqueu la casella per als elements següents:
- Impressora d'etiquetes intel·ligents *1
- Label Paper Roll *1 (inside the printer)
- Cable USB tipus C *1
- Manual del producte *1

3. Instal·lació
- Turn On and Open Compartment: Press and hold the power button for 2-3 seconds to turn on the device. Press down on the compartment release lever to open the paper compartment.
- Load Label Paper: Push the roll holders to either side. Load the label paper into the paper compartment with the printing surface facing down.
- Secure and Close: Slide the roll holders inward to secure the label paper. Pull the first label so that it protrudes from the paper outlet. Close the paper compartment cover.
Avís: The cutting blade is sharp. Exercise caution when the paper compartment cover is open.

4. Printer Software
The Niimbot B21 Pro printer requires software for operation. You can choose between mobile apps or a computer version.
4.1 Recommended App Downloads
NIIMBOT APP (Commercial Label Editing Expert): Recommended for commercial or industrial applications. Features industry-specific templates, data import, and batch printing functions.
NIIM APP (Your Home Labeling Assistant): Recommended for home storage or personal creative projects. Features fun icons and templates for household use.
Both apps can be downloaded directly from the Google Play Store or Apple App Store.
4.2 Download Computer Version
Visit NIIMBOT's official website (www.niimbot.com) to download and install the computer version of "NIIMBOT".
Nota:
- Per connectar un ordinador a aquest dispositiu, utilitzeu el cable de dades proporcionat oficialment o un cable de dades que admeti la transmissió de dades.
- The illustrations of products, accessories, software interfaces, etc., in this guide are for reference only. Due to product updates, the physical product may differ slightly.

5. Connecting to Print
- Activa el Bluetooth: Once the app is downloaded, ensure your phone's Bluetooth is turned on. (Note: Location permissions may need to be enabled on Android phones.)
- Cerca Dispositiu: Open the app and search for Bluetooth devices to connect to. If prompted for a PIN, enter 0000 or 1234.
- Start Designing: Once successfully connected, navigate to the Drawing Board within the app to begin creating your labels.

6. Instruccions de funcionament
Basic operations for the Niimbot B21 Pro printer are controlled via the power button:
| Funció | Procés |
|---|---|
| Enceneu | Manteniu premut el botó d'encesa durant tres segons |
| Apagueu | Manteniu premut el botó d'engegada durant tres segons mentre estigui encès |
| Alimentar paper | Premeu el botó d'engegada una vegada mentre està encès |
| Imprimeix la pàgina de prova | Premeu el botó d'engegada dues vegades mentre està encès |
The printer supports various applications, including printing photos, study notes, product labels, address labels, and more. The app allows for advanced features like AI design for photo printing and batch printing by importing Excel files.

7. Indicator Lights Meaning
The indicator light on the printer provides information about its status:
| Color | Estat | Significat |
|---|---|---|
| Blau | Parpellejant | Actualització del firmware |
| Blau | Sòlid | En espera |
| Verd | Parpellejant | Impressió |
| Verd | Sòlid | Bluetooth connectat |
| Vermell | Parpellejant | Charging (When the device is turned off, the light will turn off once the battery is fully charged) |
| Vermell | Sòlid | El compartiment de paper no està tancat; sense paper; o error de sortida del paper |
8. Especificacions
| Propietat | Valor |
|---|---|
| Producte | Impressora d'etiquetes |
| Model | NIIMBOT B21_Pro |
| Dimensions | 130 * 94 * 61 mm |
| Pes | 320 g |
| Temps de càrrega | 3 - 4 hores |
| Entrada | 5V CC, 1A |
| Capacitat de la bateria | Bateria de liti de 1500 mAh |
| Mètode d'impressió | Impressió tèrmica |
| Resolució d'impressió | 300 ppp |
| Màx. Resolució | 300 ppp |
| Amplada d'impressió | 20-50 mm |
| Max. Label Width | 48 mm |
| Velocitat d'impressió | 15-30mm/s (Black Print Speed), 30ppm |
| Connectivitat | Bluetooth, tipus C |
| Tipus d'interfície | Bluetooth |
| Tipus de connexió de senyal | Bluetooth |
| Transmissió de potència | 4dBm (màxim) |
| Temperatura de funcionament | 5 ~ 45 ℃ |
| Aplicació | Per a ús domèstic |
| Ús | Fabricant d’etiquetes |
| Tipus de consumibles | Paper d’etiquetes |
| Admet la impressió en xarxa | Amb cable/Sense fil |
| Impressió a doble cara | No |
| Certificació | CE, FCC, RoHS, KC, WEEE |
9. Precaucions de seguretat
Read all instructions and warnings in this guide carefully before using the product to ensure proper and safe use and to avoid personal injury or property damage.
Avís:
- Do not disassemble the product yourself. No returns or exchanges will be authorized for disassembled products.
- No utilitzeu productes químics corrosius ni netejadors per netejar el producte.
- No utilitzeu el producte a prop de substàncies inflamables, com ara benzineres, dipòsits de combustible, etc.
- Guardeu el producte i els accessoris en un lloc segur que sigui inaccessible per als nens, o només permeteu l'ús sota la supervisió d'un tutor.
- Desconnecteu immediatament el producte de la font d'alimentació si el producte entra a l'aigua.
- Desconnecteu immediatament el producte si el dispositiu funciona malament.
- Si utilitzeu un adaptador d'alimentació per carregar (o alimentar) el dispositiu, heu d'adquirir un adaptador segur, compatible i que compleixi els estàndards.
- No desmunteu el producte per substituir la bateria vosaltres mateixos. La substitució incorrecta de la bateria pot provocar una explosió.
- La bateria conté circuits i dispositius de protecció especials. No desmunteu la bateria ja que això podria provocar curtcircuits o fuites d'electròlits. Si els electròlits entren accidentalment als ulls, esbandiu immediatament amb aigua neta i consulteu un metge.
- No exposeu l'aparell o l'adaptador de corrent a entorns d'alta temperatura o humitat elevada, ni poseu-hi aigua, per evitar curtcircuits que puguin provocar que la bateria s'escalfi, s'emeti fum, es deformi, es faci malbé o fins i tot exploti.
- Desconnecteu l'adaptador de corrent immediatament si observeu fum o una olor que prové del producte o de l'adaptador de corrent, tenint cura d'evitar cremades.
10. Manteniment
To ensure the longevity and optimal performance of your Niimbot B21 Pro label printer, follow these maintenance guidelines:
- Neteja: Regularly clean the print head with a soft, lint-free cloth. Do not use harsh chemicals or abrasive materials.
- Emmagatzematge d'etiquetes: Store thermal label paper in a cool, dry place away from direct sunlight and heat sources. Exposure to high temperatures can cause the paper to darken prematurely.
- Cura de la bateria: Avoid fully discharging the battery frequently. Charge the printer regularly, even if not in constant use, to maintain battery health.
- Atenció general: Keep the printer free from dust and debris. Ensure the paper compartment is properly closed when not in use to prevent dust ingress.

11. Solució De Problemes
If you encounter issues with your Niimbot B21 Pro, refer to the following common problems and solutions:
- Printer Not Turning On: Si el dispositiu no es pot encendre, carregueu-lo durant una hora.
- Mala qualitat d'impressió: Ensure you are using special label paper for 300dpi printing. Check if the label paper is loaded correctly with the printing surface facing down. Clean the print head if smudges or faded lines appear.
- Problemes de connexió: Verify that Bluetooth is enabled on your mobile device or PC. Ensure the printer is within range (up to 10 meters). If prompted for a PIN, use 0000 or 1234.
- Red Solid Indicator Light: This indicates the paper compartment is not closed, the printer is out of paper, or there is a paper output error. Check the paper loading and compartment closure.
- Thermal Paper Sensitivity: Thermal paper is sensitive to heat. If the paper is exposed to high temperatures (e.g., left in a hot car), it may darken, affecting print quality or making it unreadable. Store labels in a cool, dry place.
- Idioma de l'aplicació: The app supports multiple languages. Check the app settings for language options if you need to switch to Traditional Chinese or another language.
- Mal funcionament del dispositiu: If the device malfunctions, immediately disconnect it from the power source.
12. Consells d'usuari
- Optimal Print Quality: For the best results with 300dpi resolution, always use special label paper designed for high-definition thermal printing.
- Handle Picture Labels Carefully: Picture labels can be sensitive to sweat, breaks, or tears, which may lead to poor printing results. Handle them gently after printing.
- Thermal Paper Storage: To prevent premature darkening or damage, store your thermal label rolls in a cool, dry place, away from direct sunlight and extreme heat (e.g., inside a car on a hot day).
- Personalització de l'aplicació: Explore the NIIMBOT app's extensive library of icons, fonts, and templates to personalize your labels. You can also manually edit labels with drawings, stickers, and emojis.
- Impressió per lots: Utilize the batch printing feature by importing Excel files into the app for efficient printing of multiple labels.
13. Garantia i Suport
This product is covered by the manufacturer's warranty. For specific warranty details, please refer to the terms provided at the time of purchase or contact customer support.
Fabricant: Wuhan Jingchen Intelligent Identification Technology Co., Ltd.
Correu electrònic de suport: service@niimbot.com
Oficial Weblloc: www.niimbot.com
Manufacturer's Address: No. 5, Creative Workshop, Creative World, Yezhihu West Road, Hongshan District, Wuhan, China
Important: Please purchase the version of the product that matches your region or country of use through the NIIMBOT official store or an authorized sales agent. Purchasing through other channels may lead to usage issues, and NIIMBOT may be unable to provide further assistance.
A digital version of this user manual is available in PDF format. You can access it via the following link: Manual d'usuari (PDF)
© 2024 NIIMBOT. All Rights Reserved. NIIMBOT is a brand under Wuhan Jingchen Intelligent Identification Technology Ltd.





