1. Introduction
This manual provides comprehensive instructions for the setup, operation, maintenance, and troubleshooting of your POLONO P31S Bluetooth Thermal Label Maker. Please read this manual carefully before using the device to ensure proper function and longevity.

Image: The POLONO P31S label maker, shown with several colorful labels it has printed, and a roll of white label tape. A smartphone displaying the companion app is visible in the background.
2. Package Contents
Verify that all items are present in the package:
- 1 × POLONO P31S Label Maker
- 1 × Roll of White Labels
- 1 × USB Charging Cable
- 1 × User Manual (this document)
- 1 × Guide Card

Image: The POLONO P31S label maker, a USB cable, a user manual, a guide card, and a roll of white labels are displayed next to the product packaging.
3. Setup Guide
3.1. Charging the Device
Before first use, fully charge the POLONO P31S label maker using the provided USB cable. Connect the USB cable to the charging port on the device and a compatible USB power adapter (not included). The indicator light will show charging status.
3.2. Installing Label Tape
- Click the unlock button on the side of the device to open the paper cover.
- Install the label tape into the paper bin, ensuring the label roll is seated correctly.
- Leave approximately 0.2 inches (5mm) of label tape extending outside the machine and close the cover.
- Press and hold the power button to turn on the device. Click the power button again to calibrate the label tape.

Image: A four-step visual guide demonstrating how to open the label maker, insert the label tape, leave a small portion exposed, and calibrate the device.
3.3. Downloading the Labelnize App
The POLONO P31S operates via the 'Labelnize' mobile application. Download the app from your device's app store:
- For iOS devices: Download on the App Store
- For Android devices: Get it on Google Play
3.4. Connecting via Bluetooth
- Ensure Bluetooth is enabled on your smartphone or tablet.
- Open the Labelnize app.
- Within the app, search for and select 'P31S' from the list of available devices to establish a Bluetooth connection.

Image: A visual guide showing how to scan a QR code for the app, click 'Unconnected' in the app, find and connect to 'P31S' via Bluetooth.
4. Operating Instructions
4.1. Creating Labels with the Labelnize App
The Labelnize app offers a variety of features for label creation:
- Templates: Access a large number of pre-designed templates for various uses.
- Text: Input custom text with various fonts and styles.
- Graphics & Symbols: Add icons, images, and other graphical elements.
- Barcodes & QR Codes: Generate and print barcodes and QR codes.
- AI Gallery: Utilize AI-generated designs and images for your labels.

Image: A smartphone screen displaying the Labelnize app, showcasing options for adding elements like text, barcodes, QR codes, and icons, along with various label templates.
4.2. Printing Labels
After designing your label in the Labelnize app, select the desired label size and paper type. Then, click the 'Print' button within the app to send the label to your P31S device.
4.3. Cutting Labels
The POLONO P31S features a built-in cutting blade for neat label separation. After printing, do not pull the label out directly. Instead, press the cutting button to cleanly cut the label.

Image: A detailed view of the label maker's output slot, highlighting the internal cutting mechanism and a label being cut.
4.4. Supported Label Sizes
The POLONO P31S supports various fixed-length label sizes, including but not limited to:
- 12x40mm
- 14x40mm
- 14x50mm
- 15x40mm
- 14x75mm

Image: A display of different label sizes (e.g., 12x40mm, 14x40mm, 14x50mm, 14x75mm) with various printed designs, demonstrating the versatility of the label maker.
5. Maintenance
5.1. Label Tape Care
To ensure optimal print quality, do not tear or damage the green sticker located on the back of the label tape. This sticker is crucial for the printer's detection and proper functioning.
5.2. Cleaning the Printer
Regularly clean the print head and the interior of the label maker with a soft, lint-free cloth. If necessary, use a small amount of isopropyl alcohol on the cloth for stubborn residue. Ensure the device is powered off and disconnected from any power source before cleaning.
6. Troubleshooting
- Device Not Connecting: Ensure Bluetooth is enabled on your mobile device and the label maker is powered on. Restart both the app and the label maker if connection issues persist.
- Poor Print Quality: Verify that you are using genuine POLONO thermal label paper. Ensure the label tape is installed correctly and the green sticker is not damaged. The print resolution is 203dpi.
- No Print Output: Check if the label tape is properly loaded and if there is enough tape remaining. Ensure the device is charged.
- Incompatible Device: The POLONO P31S supports iOS 13 or above and Android devices. It is not compatible with computers.
- Continuous Labels Not Printing: This mini label printer is designed for fixed-length labels and does not support continuous label tapes.
- Color Printing: The POLONO P31S is a thermal printer and can only print in monochrome (black and white).
7. Specifications
| Feature | Detail |
|---|---|
| Brand | POLONO |
| Model Name | P31S |
| Printing Technology | Thermal |
| Connectivity Technology | Bluetooth |
| Compatible Devices | iOS 13 or later, Android |
| Maximum Print Resolution | 203dpi (Monochrome) |
| Printer Output | Monochrome |
| Max Print Speed | 80mm/s |
| Supported Label Sizes | 12x40mm, 14x40mm, 14x50mm, 15x40mm, 14x75mm (Max 12x75mm) |
| Item Weight | 8.1 ounces |
| Package Dimensions | 5.04 x 3.03 x 2.56 inches |
| Special Features | Portable, Clear Printing, Easy to Use, Rechargeable, Wireless, Inkless, Built-in Cutter |
8. Warranty and Support
8.1. Warranty Information
The POLONO P31S Label Maker comes with a manufacturer's warranty. Please refer to the guide card included in your package or visit the official POLONO website for detailed warranty terms and conditions.
8.2. Customer Support
For further assistance, technical support, or inquiries regarding your POLONO P31S Label Maker, please visit the official POLONO Store or contact their customer service through the provided channels on their website.
Visit the POLONO Store: POLONO Official Store





