What does dual-frequency WiFi mean?

Dual-frequency WiFi refers to a device that supports 2.4ghz/5ghz dual-band wireless signals and supports a 802.11a/b/g/n full wireless network, which belongs to the fifth generation Wi-Fi transmission technology (5G Wi-Fi), Typically, the routers or some WiFi devices that we are exposed to on a daily basis support 2.4Ghz WiFi, which is likely to be a new generation of wireless technology with high-end routers or some future tablets, boxes, and smartphones.

Dual-frequency WiFi devices have the advantage of stronger and more stable WiFi wireless signal, faster transmission speed, and can make wireless devices more power, to meet future high-definition and large data wireless transmission needs.

As a simple example, just like urban roads, some roads can only be one-way, while some roads support two-way driving, 2.4G is like one-way road, more crowded. If you support 2.4G and 5G, it's like the road is as smooth as a freeway.