Label printer NIIMBOT B21S Red — compact thermal Bluetooth printer, 50 mm print width, 60 mm/s, 1200 mAh battery

The NIIMBOT B21S portable label printer in red is a compact thermal printer designed for on‑demand printing of adhesive labels and tags. It connects via Bluetooth or USB‑C to smartphones and tablets and operates without ink, using thermal paper. The device includes a 1200 mAh rechargeable battery for extended use, supports label widths from 20 to 48 mm, and prints at 203 dpi for clear text and barcodes.

Advantages

The B21S offers fast, inkless thermal printing with a rechargeable 1200 mAh battery and both Bluetooth and USB‑C connectivity. A dedicated Niimbot app (Android and iOS) enables label design, font and size adjustment, barcode/QR code generation, serial printing and import from Excel. Compact dimensions (130 x 94 x 61 mm) and a lightweight build (299 g) make it suitable for mobile or countertop use.

Suitable for

• Retail — price tags, EAN barcodes, expiration dates
• Home organization — labeling jars, food containers, storage boxes
• Office and inventory — asset tags, file and shelf labels
• Event or craft use — QR codes, small custom labels

Key specifications

• Manufacturer: Niimbot
• Model: B21S
• Color: Red
• Type: Thermal label printer
• Resolution: 203 dpi
• Roll width: 20–48 mm
• Battery capacity: 1200 mAh
• Charging time: 3–4 h
• Power: 4 dBm Max.
• Input voltage: DC 5V/1A
• Charging port: USB‑C
• Connection: Bluetooth, USB‑C
• Operating temperature: 5°C–40°C
• Dimensions: 130 x 94 x 61 mm
• Weight: 299 g

How to use

Charge the printer via the included USB‑A to USB‑C cable until the battery is full (about 3–4 hours). Install the Niimbot app on your Android or iOS device, pair the printer over Bluetooth or connect with USB‑C, and load a compatible thermal label roll (20–48 mm width). Design or select a label in the app, adjust font and layout as needed, then send the print job. The thermal mechanism prints without ink, so use only thermal-compatible label rolls.

Recommendations

Use Niimbot-approved thermal paper rolls within the specified width range (20–48 mm) for reliable feeding and print quality. Keep the device and labels dry, operate within the 5°C–40°C range, and charge the battery regularly to maintain consistent performance.