The Polaroid Hi-Print printer is easy to use but, when it is connected to the phone, you need to be aware of some details, read here all about the connection.
Once you connect your Polaroid Hi-Print with your phone using the Polaroid Hi-Print app, the connection will stay on as much as you need but, if the app gets minimized, or the phone is lock, the connection will be lost. Also, if you are not using the Hi-Print printer but it is still on and connected, after 5 minutes, the printer will automatically switch off and the connection will be interrupted.