engineer heydari, the secretary of organizing the 27th edition of the al-kham exhibition , explained the technology as well as the guests a number of reports have been presented at this year's exhibition. a report on one of the technologies has been prepared . let's see this report. we will come back and be at your service . there are different power levels, from 10 watts to 30 watts under the network. in addition, we have special products such as amplifiers under the network, which we can offer this technological product according to the needs of our customers. it is used in different areas, in environments like this issue that needs you do a collective hand page, like in hospitals , do a wide page, or in my factory, there is also a public announcement, a system has been established, or in the factory or , for example, tunnels, for example , you would do an urgent announcement to do an emergency, sir, for example, such a problem. there is a problem in the city, pay tuition fees. this system , which is domesticated at half the price of the same foreign model, we are product designers