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Black rectangular thermal label printer with roll compartment and USB port

Honeywell RP421A-BU-BK 4x6 Direct Thermal Label Printer

SKU CH-DYCX-8RQMD MPN RP421A-BU-BK

Direct thermal 4 x 6 inch label printer with Bluetooth and USB for Windows, Mac, Android and iOS

  • Print TechnologyDirect Thermal
  • CutterRewind
  • Ribbon CharacteristicsInkless, Thermal
  • Media sizes supported4.1 in x 9.5 in x 4 in
  • Print Size4 X 6 inches
  • InterfaceUSB
  • Wireless printing from phones via Bluetooth connection
  • USB cable link for Windows and Mac computers
  • Direct thermal technology removes ink and toner costs
  • Works with major shipping and marketplace platforms
  • 4 by 6 inch labels on a compact desktop unit

Product Identity

The Honeywell RP421A-BU-BK is a direct thermal label printer that produces 4 x 6 inch labels without ink or toner. It connects via Bluetooth for iOS and Android devices or USB for Windows and Mac computers. Small-business owners shipping through Amazon FBA, Shopify, FedEx and similar platforms can print shipping labels, barcodes and logos from a phone, tablet or desktop.

Thermals Noise Power

Direct thermal technology means the print head heats only the label surface, so there is no ribbon, toner cartridge or ink reservoir to replace. The mechanism runs quietly during typical label batches and draws power only while printing. A rewind cutter handles label separation without a separate cutting blade.

Sustained Load Behaviour

The printer is designed for intermittent label runs rather than continuous high-volume output. Extended sessions will warm the print head, and the driver installation process on Windows or macOS takes about 60 seconds per the manufacturer guide. Bluetooth pairing uses a simple numeric code. Heavy all-day shipping queues may require cool-down pauses.

Highlights

  • Wireless printing from phones via Bluetooth connection
  • USB cable link for Windows and Mac computers
  • Direct thermal technology removes ink and toner costs
  • Works with major shipping and marketplace platforms
  • 4 by 6 inch labels on a compact desktop unit

Specifications

BrandHoneywell
ModelRP421A-BU-BK
Part NumberRP421A
Print TechnologyDirect Thermal
CutterRewind
Ribbon CharacteristicsInkless, Thermal
Media sizes supported4.1 in x 9.5 in x 4 in
Print Size4 X 6 inches
InterfaceUSB
Windows CompatibleWindows 98/ME/2000/XP
Macintosh CompatibleiOS
Dimensions14.33in W x 12.83in H x 9.06in D
Package ContentsLabels

Questions about this item

How do I install the driver on Windows and what step is often missed?

Download the driver from rongtaglobal.com/rp421a, run the 60-second setup guide, then connect the USB cable; the step often missed is installing the driver before plugging in the printer.

What part will need replacement over time and how is it loaded?

The direct thermal label roll is the consumable; open the cover, place the 4.1 in x 9.5 in roll on the spindle, feed the leading edge through the guides, and close the latch.

What limit appears first during continuous batch printing?

The printer uses direct thermal technology without active cooling, so the printhead temperature limit is reached first during sustained high-volume runs.

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