1. Introducció
Thank you for choosing the vretti Thermal Label Printer. This manual provides detailed instructions for setting up, operating, and maintaining your printer. This printer is designed for efficient and high-speed printing of various labels, including shipping, address, barcode, and custom labels, supporting both wireless (2.4GHz WiFi) and USB connections across multiple operating systems.
2. Producte acabatview
The vretti Thermal Label Printer is a versatile device featuring advanced thermal printing technology, eliminating the need for ink or toner. It is equipped with a built-in label bin for convenience and supports a wide range of label sizes.
Característiques principals:
- Impressió sense fils: Supports 2.4GHz WiFi connectivity for printing from Windows, macOS, iOS (iPhone/iPad), and Android systems.
- Connexió USB: Compatible with Windows, macOS, Chrome OS, and Linux via USB cable.
- Compatibilitat amb plataformes àmplies: Seamlessly integrates with major e-commerce and logistics platforms such as Amazon, eBay, Shopify, USPS, UPS, FedEx, DHL, and more.
- Built-in Label Bin: Features an integrated label holder, accommodating rolls up to 500 4x6 inch labels, eliminating the need for an external holder.
- Suport versàtil d'etiquetes: Prints direct thermal labels with widths ranging from 1 inch (25.4mm) to 4.5 inches (115mm), with a maximum print width of 4.25 inches (108mm). Ideal for 4x6 inch shipping labels, warehouse labels, barcodes, ID labels, and more.
- Impressió d'alta velocitat: Capable of printing at speeds up to 152mm/s, or approximately 72 4x6 inch labels per minute.

Figure 2.1: vretti Thermal Label Printer with a sample label and connectivity icons.

Figure 2.2: Connectivity options and key features of the vretti Thermal Label Printer.
3. Configuració i instal·lació
3.1 Desembalatge i configuració inicial
- Traieu amb cura la impressora i tots els accessoris de l'embalatge.
- Connecteu l'adaptador de corrent a la impressora i connecteu-lo a una presa de corrent.
- Enceneu la impressora amb l'interruptor d'alimentació.
3.2 Càrrega d'etiquetes
The printer features a built-in label bin. Open the top cover of the printer. Place your roll of direct thermal labels into the bin, ensuring the labels feed smoothly through the guide. Close the cover. The printer will automatically detect the label size.

Figure 3.1: Loading labels into the built-in label bin.
3.3 Instal·lació de controladors i programari
Before printing, ensure the correct drivers are installed for your operating system.
- Windows/macOS/Linux (USB Connection):
Connect the printer to your computer via the provided USB cable. Drivers can typically be found on the included U-disk or downloaded from the official vretti support website. For macOS, if you encounter "The application can't be opened" during installation, go to "System Settings" > "Privacy & Security", scroll down, and click "Open Anyway".


Figure 3.2: USB and WiFi connectivity options.
- Chrome OS:
Obtain the Chrome OS extension from the included U-disk. Drag the extension file to the Chrome extensions page to install.

Figure 3.3: Installing the Chrome OS extension.
- Mobile Devices (iOS/Android - WiFi Connection):
Download the "EZLABEL" app from your device's app store. This app is required for wireless printing from mobile devices. Ensure your mobile device and printer are connected to the same 2.4GHz WiFi network.
Download EZLABEL app: EZLABEL Download
- General Driver/Software Download:
For additional drivers or software, including the 4Barcode software, please visit: 4Barcode Download
4. Instruccions de funcionament
4.1 Connexió a WiFi
To connect your printer to a WiFi network, follow the instructions provided in the EZLABEL app for mobile devices or the printer's software utility for desktop operating systems. Ensure your network is 2.4GHz, as 5GHz networks are not supported.
4.2 Impressió d'etiquetes
Once drivers are installed and the printer is connected (via USB or WiFi), you can print labels from your preferred application (e.g., shipping software, word processor).
- Ensure the label size settings in your printing application match the physical labels loaded in the printer.
- The printer supports label widths from 0.78 inches (19mm) to 4.6 inches (116mm).
- The printer automatically detects label size for optimal printing.

Figure 4.1: Supported label widths and types.

Figure 4.2: High-speed printing capability.

Figure 4.3: Compatibility with major e-commerce platforms.

Figure 4.4: Diverse label applications.
5. Manteniment
5.1 Neteja de la impressora
Regular cleaning ensures optimal print quality and extends the life of your printer.
- Apagueu i desendolleu la impressora abans de netejar-la.
- Utilitzeu un drap suau i sense pelusa dampened with isopropyl alcohol to gently wipe the print head and platen roller.
- Remove any dust or label residue from the label path and inside the label bin.
- Allow all components to dry completely before plugging in and turning on the printer.
5.2 Label Bin Maintenance
Ensure the label bin is free of debris and that labels are loaded correctly to prevent jams. The built-in label bin is designed for rolls with diameters less than 11cm (4 inches).
6. Solució De Problemes
Problemes comuns i solucions:
| Problema | Causa possible | Solució |
|---|---|---|
| La impressora no respon / No hi ha alimentació | Power cable loose; Printer off; Power outlet issue. | Check power connections; Ensure printer is turned on; Try a different power outlet. |
| "The application can't be opened" (macOS) | Security settings blocking unsigned application. | Go to "System Settings" > "Privacy & Security", scroll down and click "Open Anyway" for the driver installer. |
| Cannot print via WiFi | Incorrect WiFi network (5GHz); Printer not connected to network; App not configured. | Ensure printer and device are on the same 2.4GHz WiFi network; Reconfigure WiFi settings in the EZLABEL app or printer utility. |
| Poor print quality / Blank labels | Print head dirty; Incorrect label type (not direct thermal); Labels loaded incorrectly. | Clean the print head; Ensure you are using direct thermal labels; Reload labels correctly. |
| Labels not feeding correctly / Jams | Label path obstructed; Labels not aligned; Label roll too large for bin. | Clear any obstructions; Realign labels; Ensure label roll diameter is less than 11cm (4 inches). |
7. Especificacions
| Característica | Detall |
|---|---|
| Marca | vretti |
| Nom del model | 420B-5G |
| Tecnologia de connectivitat | Wi-Fi (2.4GHz), USB |
| Tecnologia d'impressió | Tèrmica |
| Sortida de la impressora | Monocrom |
| Velocitat màxima d'impressió (monocrom) | 72 ppm (4x6 labels/minute) |
| Resolució màxima de còpia (blanc i negre) | 203 DPI |
| Mida màxima del suport | 4x6 inches (Max print width 4.25 inches / 108mm) |
| Amplada de l'etiqueta compatible | 1" (25.4 mm) a 4.5" (115 mm) |
| Dimensions del producte | 8" de profunditat x 6.69" d'amplada x 5.9" d'alçada (20.32 x 17 x 15 cm) |
| Pes de l'article | 4.58 lliures (2.08 kg) |
| UPC | 717813676710 |
| Característica especial | Portable, Built-in Label Bin |
8. Garantia i Suport
8.1 Informació de la garantia
The vretti Thermal Label Printer comes with a limited warranty. Please refer to the warranty card included in your product packaging for specific terms and conditions. Retain your proof of purchase for warranty claims.
8.2 Atenció al client
For technical assistance, troubleshooting not covered in this manual, or warranty inquiries, please contact vretti customer support.
- Assistència en línia: Visit the official vretti weblloc web per a preguntes freqüents, controladors i informació de contacte.
- Suport al venedor: For purchase-related inquiries, you may also contact the seller "vretti-us" through the platform where you purchased the product.





