The maximum distance that a general wireless router can cover is usually 100 meters to 300 meters, but the coverage range mainly depends on whether the environment is open or not. When the device does not add an external antenna, it is about 300 meters in the field of view；

After testing, we found that many times the wireless signal transmission distance of the wireless 4g lte router with sim slot is generally about 20-30 meters. The reason is that the effective distance is reduced due to buildings, objects, and signal interference. The network speed is unstable, and there are many other reasons. There are factors such as voltage instability and electromagnetic interference. Of course, there are also high-end routers with stable transmission and long distance.

4g industrial-grade wireless routers are mainly used in industrial environments, or places where the environment is relatively harsh, and it is also inconvenient to pull cables. With the help of 3G/4G technology, high-speed routers, use public WCDMA/EVDO/LTE/HSPA+ networks for users Provide wireless long-distance data transmission function. Can provide wireless network coverage for mobile carriers. Through the intelligent terminal equipment installed on the car, the mobile communication signals emitted by the 3G base stations set up along the way are converted into network signals of stable quality (such as Wi-Fi signals), which can easily satisfy the passengers in the carriage for browsing the web, watching videos, "Smart" needs such as Weibo.