The device is designed for places with poor 4G reception. With the task of distributing mobile Internet to several devices, it copes perfectly. The kit includes two external antennas. It's not clear why, though. On the built-in antennas, reception is more than confident (mobile Internet speed on a smartphone is 1 Mb, on a router 7 Mb). I did not find any difference in operation on external and internal antennas.
Wi-Fi router Xiaomi Mi Wi-Fi Router 4A Gigabit Edition Global, white
165 Review
Experience Faster and More Stable Internet with Xiaomi Mi Router 4C
103 Review
Wi-Fi router Xiaomi Redmi Router AC2100 CN, white
106 Review
Gigabit Wireless AP RB951G-2HND π» Mikrotik with 1000mW Power and 5 Ports
124 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
π uni USB C Hub with Ethernet Adapter, 4K HDMI, Gigabit Ethernet, and 3 USB 3.0 Ports for MacBook Pro, iPad Pro, XPS
11 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review
π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review