· Easy & Efficient Printing: The thermal printer features a user-friendly design with simple controls, making it easy for anyone to use. Advanced thermal printing technology no need for ink or toner, to keep away from stains, effectively reducing the cost of supplies. Rohm print head ensures clear print quality even at high speeds and continuous printing.· Bluetooth for Mobile Phone: MUNBYN RealWriter 130 Bluetooth label printer, supports Bluetooth connection for iOS and Android systems, and prints labels anytime, anywhere. Download the "MUNBYN print" app for quick and easy label printing.· USB for PC: MUNBYN RealWriter 130 Bluetooth Thermal label printer specially configured with a USB cable for macOS, Windows (7 and later) system computers. You can even add "MUNBYN Printer" extensions on Chrome browser for Chromebook use. (Note that Laptop and Desktop only work with a USB connection, you can not print via Bluetooth.)· [ Authentic Munbyn Labels ] 4" x 6" (101.6mm x 152.4mm). 500 shipping labels per roll. Roll Diameter: 4.7''(120mm). Please make sure that the diameter of the built-in paper warehouse label printer is greater than 4.7'' before purchasing. It is only suitable for thermal printers and not for laser or inkjet printers.· [No Bpa and Bps] Bpa (Bisphenol A) is an industrial chemical. It can cause endocrine disorders and have certain effects on people's health. Our paper has been tested to contain no carcinogens such as Bpa and Bps.