Flexible switched size: 216mm/210mm/107mm/77mm/57mm (US letter/A4/4"/3"/2") width, also supports rolls and folding paper. Meet your printing needs for many occasions! Suitable for business trips, school, car, and other mobile scenarios, print anytime and anywhere. Easily handle official documents, shipping labels, design drawings, and exam documents on the spot. All-in-One Printer: The A4 thermal printer supports Bluetooth connection for iOS and Android phones and supports USB connection for Windows 7-11（Note: Computer connection needs to use the data cable included in the package). Connecting quickly and works right out of the box! The portable thermal printer is equipped with a wide range of file formats, including Word, Excel, PPT, TXT, and JPG. The Print App also supports template printing and photo printing. One printer creates multiple values. Compatible with ChromeOS: This A4 portable printer supports connecting to Chromebooks. Please make sure you are using the correct extension when printing from your Chromebook. You can check the details in the guidance video.