Hi gabak,
the non-technical explanation for "dual chain" is, that there are "two sources of and two inputs for" the wireless signal.
Dual chain therefore also means "MIMO" (multiple in, multiple out).
"Dual band" means, that the device will send at for example 2.4GHz and 5GHz at the same time.
The "N" means 802.11n (for details see wikipedia e.g.:
https://en.wikipedia.org/w/index.php?ti ... edirect=no).
Ape