Ejecting internet data card

I am using now an internet data card which I have to plug into one of the USB ports. An icon on the desktop appears after I plug it in, but it disappears as soon as the app is launched. After the net session is over I quit the app. No icon is there on the desktop for me to eject. so I just have to unplug the data card. No error message or warning appears when I unplug.
Earlier I had another data card and its icon used stay on the desktop all through the net session. After quitting I used to eject the device by right-clicking on the icon before unpluging it from the port. 
With the new data card now, is there any possibility of damage either to the data card or the Mac if I continue to unplug without ejecting? Or, is there some way to eject the device?

I assume you are using wireless modems that you plug into the USB port for Internet acess
I do not think you have a problem.  I have two with different service providers.  One requires installation of operating software and if I take it out I get the Apple error message.  The other one does not have any software an I can put it in or take out of the USP port with no protests from the MBP.
You are not going to damage the MBP or the device.
Ciao.

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