• 2.4G band：As the most mature WiFi frequency band, its core advantages are strong signal penetration and wide coverage. Even through two or three walls, the signal can still be transmitted stably, making it suitable for long-distance connections or use through walls. However, its shortcomings are also obvious: the transmission speed is relatively slow, with a theoretical rate of only 72Mbps under the 802.11n protocol, and the frequency band is congested, making it susceptible to interference from neighboring WiFi and Bluetooth devices.

• 5G band：It can be described as a "high-speed dedicated channel," with an entry-level speed of 433Mbps and a dual-antenna gigabit router capable of reaching 866Mbps, easily meeting high-speed needs such as large file transfers and 4K video casting. However, its weakness is weak signal penetration; the signal strength may be halved after passing through a wall, and the coverage area is far less than that of 2.4G, making it more suitable for short-distance, unobstructed scenarios.

2.4GHz band has a wider coverage area than the 5GHz band under the same conditions.

Simply put, 2.4G is suitable for "wide coverage and stable connection", while 5G is suitable for "short distance and high speed". The two frequency bands, which originally had their own functions, are integrated into a single WiFi signal under the dual-band merging function.

• router uses the same WiFi name (SSID) and password for both the 2.4G and 5G bands, so users will only see one signal when searching.
• When connecting, the router will intelligently determine the connection based on factors such as device distance, signal strength, and network load, and will usually prioritize guiding the device to the 5G band with faster connection speed;
• When the device is far from the router or the 5G signal weakens, it will theoretically automatically switch to the 2.4G band to ensure uninterrupted connection.

From the original design perspective, this feature can indeed solve the pain points of users who "cannot distinguish between the two frequency bands" and "find it troublesome to frequently switch WiFi", and is especially suitable for ordinary household users who are not familiar with network principles.

While the concept is appealing, in actual use, the "smart" dual-frequency integration often malfunctions, causing more problems. This is the key reason why it is not recommended for ordinary users to enable it.

1. Smart home devices "not recognized" and disconnected directly.

2. Mobile phones and other terminal devices cannot connect to 5G, resulting in a loss of high-speed experience.

core selling point of dual-band integration is "prioritizing 5G connection," but in real-world scenarios, many phones encounter the awkward situation of "wanting to connect to 5G but being unable to."

• 5G signals have weak penetration; in the same location (such as a bedroom where the router is a little far away), the 5G signal strength is often weaker than that of 2.4G.

• router's "smart boot" algorithm is not perfect. When the signal strength of two frequency bands is similar, the mobile phone may misjudge and prioritize connecting to the 2.4G frequency band with a stronger signal but a slower speed.

• Some mobile phone models have poor compatibility with dual-band merging. Even in areas with good 5G signal coverage, they cannot automatically switch to 5G and can only stay on the 2.4G band, completely negating the advantages of high-speed networks.

Whether to enable dual-band merging depends primarily on your usage scenario:

• It is not recommended to enable it：If you have multiple smart devices at home (especially those that only support 2.4G), or if you have specific needs for network speed (such as frequent screen mirroring or transferring large files), it is recommended to disable dual-band merging, set two separate WiFi names (such as "XX Home - WiFi" and "XX Home - WiFi-5G"), and manually assign frequency bands to the devices—smart devices connect to 2.4G, while devices used at close range, such as mobile phones and computers, connect to 5G, which is both stable and can take advantage of high speed.
• Can be turned on：If you don't have any smart devices at home, and all your devices (phones, computers) support the 5G band, and you're too lazy to manually switch WiFi, then dual-band merging can bring a simpler user experience, so it's fine to turn it on.