The Teclast tablets do not work in the United States for 4G LTE they don't have the proper bands. That fact is not noted on their website. They only list the channel bands but don't tell you what country they work in. It's up to the purchaser to figure that out.
Teclast has unveiled a new tablet, the T50 Max. The device is equipped with an 11-inch, 90 Hz display and features the MediaTek Helio G99 as well as LTE connectivity. However, a few questions remain unanswered.