The TL-MR105 from TP-LINK is a router, a device to which other devices (e.g., computer, mobile phone, television) connect either wirelessly or via cable, and it distributes internet access to them. For internet access, it needs to connect to a modem. It connects to the 4G network, which offers significantly higher speeds than 3G. For the device to operate at this speed, there must be corresponding coverage from the mobile network in the area where we are.
It is of Wi-Fi 4 generation, an older generation recommended for use with a few devices and for applications that do not require high speeds. It broadcasts a signal on one frequency, 2.4Ghz, which offers lower speed compared to those that broadcast on 2 (dual) or 3 (tri-band) frequencies. The 2.4Ghz frequency is the most widespread and has a long range.

It features an SPI firewall, a mechanism that checks data traffic for patterns of known types of attacks (e.g., DDoS). It offers WPA2 security, a protocol that replaced WPA in 2004 and uses AES (Advanced Encryption Standard) technology, which is approved by the U.S. government for classified documents. It is considered safe for home use.