Finally found a solution to the problem of poor communication in the car. This compact box amplifies the cellular network signal in the cabin by 5-10 times! The principle of work is as follows: outside the antenna catches weak signals from towers, amplifies them and transmits them inside. There, the second antenna amplifies them even more. As a result, the smartphone can catch a full-fledged signal even where there was no connection at all before. The repeater is installed literally in a couple of minutes. Now even in the deep woods drive, calls and Internet on your phone will work stably. And most importantly, this amplifier is suitable for all carriers and supports even the most modern 5G communication.