In one end of the unit (top) there is a AOSS button. AOSS’s function is to provide an easy way to pair your client computer with the access point. AOSS (airstation one-touch security system) is a bit insecure in my opinion as it uses only 64-bit WEP keys to encrypt the data. More information about the AOSS can be found for example found from wikipedia.
The backpanel of the unit has five RJ-45 ports. Four of them are attached to the 10/100M switch while the blue one is WAN port (also 10/100). The unit is capable of routing up to 100Mbps internet speeds via the WAN port and I tested that feature and proved it to be true. With a reasonable amount of packets WHR-G300N V2 had no problems routing my 100M internet connection.
If you want to put the WHR-G300N V2 in vertical position, it comes with a handy stand. The stand makes it easy to store WHR-G300N V2 in places where the space (in vertical) is limited.