Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does the ethernet port can be used to plug a non-wifi device and use the 3G Connection ?
Document: D-Link DIR-412 Mobile Wireless Router 3G, 11n-based, 150MbpsI wanted to use my Apple WiFi iPad (non-3G model) while traveling but since most hotel rooms still require that you use a cat-5 RJ-45 connection for their free internet this was not going to be of much use since the iPad does not have a RJ-45 port.
I looked at the wifi hotspot type products but most of those require a 1-2 year contact and can cost up to $40-60 per month for the data service which adds up fast over a 12 month period. This device solves the problem nicely. It can be attached to the hotel cat-5 cable or can accept several different USB 3G modems to create a local wifi hotspot that the iPad or iPod type devices can use as well as my laptop using it's wifi connection.
The device turned on and I was able to make a wireless connection between it and my computer but my AT&T modems would not turn on. The Amazon advertisment clearly stated compatible with various large carriers including AT&T. The AMAZON statement is an extreme exaggeration of reality. Perhaps some few AT&T modems work. I have Sierra 3G wireless Shockwave and the newer Sierra  wireless 4G Momentum. Neither of which will work with this device. Wasted Money.
I recently traveled internationally with this router. I gave up trying to get the 3G mobile side running, it just never worked. I suppose there are too many 3G modems and configurations out there. I also used it as a wireless modem where an internet connection was available, one site worked great and at another site it would simply not connect to the network.
Small, Mobile, and sleaky with the top USB direct connect. You can use both the 3G DATA, or LAN connect.Only thing is dont expect the same coverage strength as a larger and standard Wifi router.Signal will drop 1-2 bar for same distance, when compared to standard large router.In Singapore sells for &lt;50 USD, fyi.
Can't be used unless you have 110 volts ac.... No way to use it with portable power supply and no way to connect it to laptop for power either.... Dumb product!
Plugged this unit into the free wired connection, set it up for the first time (I could have done it at home first, but I wanted to try it at the hotel first to see if I could do it), set up all the security I needed, and all the fams devices were able to surf wirelessly, all while the hotel was thinking it was one device.Look this device up on other websites. It still sells for over $60. This device is a no brainer.
I was a little scare to buy this product. I read some bad reviews. I live in New York, I put AT&T connection on it with my USB connection and it worked perfect always. A little hard at the beginning to know how it is really working but after a few tries, very easy to set up and make it work. Now I have wifi in the whole house. I cannot be happier. I recommend to every one!
If you're going to be using a 3G wireless router in a foreign country, you best check FIRST BEFORE BUYING to make sure that hardware/firmware is updated and compatible with that country. I might as well have burned the money I paid for this outdated non-usable router.
For that, it will be ok.  For the price, I was expecting more.I don't plan to use the 3G connectivity, so it may perform better a data card than straight wireless.It's ok.  Not great.
Answer: Yes like any other router