There are three ways to access the SN of the printer: Connecting to "Phomemo" App/Printing a self-test page/Scanning the QR code on the printer

1. Option1: Connecting "Phomemo" App to access SN

1. Open the "Phomemo" App.
   
2. Tap the printer icon in the upper right corner to search for and connect the printer.
   

2. Option2: Print a self-test page to access SN

1. Ensure that you are using thermal printing paper (you can verify this through the packaging or the product listing).
   
2. Confirm that you have loaded the printing paper correctly (the thermal-sensitive side of the paper should be facing the print head directly).
   
3. Double-click the power button to print a self-test page. It should print as shown below.
   
   

3. Option3: Scanning the QR code on the printer to access SN

1. Locate the scannable QR code on the device and using your phone to scan it. (Note: the image below is just an example.)
   
2. You will be redirected to a webpage as shown below. Find the serial number (SN) that starts with a "Q", take a screenshot of this page or copy it and send to us.