Tips:The "GFLP 801-USB" printer can print on a windows/mac computer, and doesn't support Bluetooth. The "GFLP 801-BT(Bluetooth)" printer can print on windows/mac Computer and Support Bluetooth.Respected User:Experience, Before You Use The GFLP801 Printer, Please Understand The Following Precautions In Detail.1. Please Install The Printer Driver Before Use (Windows And Mac Drivers Are Available In The USB Flash Drive). Note: The "Label.Dmg" Driver File Must Be Installed When Using The Printer On A Mac Computer.2. When Using The Bluetooth Version, Please Connect The Printer In The "Print Label" App, Otherwise It Will Not Be Able To Print.3. When The Printer Switches Mobile Devices, Please Disconnect The Bluetooth Of The Mobile Phone First.4. Incorrect Label Size Will Print Blank Labels, Please Set The Correct Label Size.