Will your label stock work?
Direct thermal describes the printing process, not universal label compatibility. Check the roll format, dimensions and any manufacturer-specific recognition requirements.
Which device will print the labels?
USB, Ethernet, Wi-Fi and AirPrint are different connection paths. A mobile app name does not establish wireless hardware or support on every operating-system version.
What does the speed figure measure?
Millimetres per second and small address labels per minute are not equivalent four-by-six shipping-label throughput. Read the stated label size, mode and host conditions.