What is Dual Band Router?
There are four protocols and two frequencies when dealing with WiFi. What are they?
Protocols A, B G and N and Frequencies 2.4 GHz and 5 GHz.
Some routers can only emit the 2.4 GHz frequency while others can only emit the 5 GHz frequency.
The Dual Band Router can emit both frequencies
Now what does that do for you?
1. You router is compatible with a larger range of devices (a,b,g,n) 2. The 5 GHz is supposedly faster than the 2.4 GHz when operating at the 5 GHz frequency 3. The 5 GHz is supposedly more stable (less interferences)
Personally I have yet to see a household networking device that uses the 5 GHz exclusively.
To go further some devices are even locked into using the 2.4 GHz band.
So to Take advantage of the 5 GHz band, your device must support it.
If you want to transfer large files wirelessly and you have the extra cash the dual band is the way to go otherwise it may not be necessary yet (at least at the time of writing).