It is recommended not to open it together. The combination of dual frequencies for a while will lead to the disconnection of smart devices, resulting in the non-stop switching of some mobile phones between 2.4G and 5g, resulting in the inconvenience and instability of network use.
Dual band WiFi of wireless router refers to two frequencies. In the past, traditional wireless routers were single band routers, which generally only transmit 2.4GHz single band wireless signals. The dual band router adds 5GHz frequency, that is, it provides 2.4GHz and 5GHz at the same time. 2.4G frequency band, the frequency range is 2401mhz --- 2487mhz; 5g frequency band, with frequency range of 4980mhz --- 5825mhz. It can be seen that the two are complementary in terms of frequency range.
Dual band routers are also divided into two types. One is dual band single selection, that is, 5g cannot work when 2.4G works, and vice versa. This dual band has little practical significance. Another kind of dual band online at the same time is very good. At present, most of the latest routers belong to this kind, so when you buy, you must pay attention to the difference and don't choose the wrong one.
In short, 2.4G has long transmission distance, good wall penetration effect and stable WiFi signal. On the contrary, 5g has the characteristics of short transmission distance, poor wall penetration effect and unstable WiFi signal. Of course, the biggest advantage of 5g is that the transmission rate is much faster than 2.4G. （wifiShuangPinGeYiYaoBuYaoKai）