I have a lot of noisy feedback from mine. Tried adjusting volume levels, it always makes a humming sound. Annoying, so I think I will re gift this one!!!

Sorry dude, ‘think you missed the point of this device assuming this is the same kit as in the office of the last company I worked for.
If you’re looking for speakers for music, speakers, move on. However, if you want a really excellent hands-free/headphone-free device for Skype, Link or other VOIP-based calls/conferences, this is the bizz.
At less than £20 on Amazon (UK) its a bargain compared to any fancy Plantronic device. Audio output is spot-on (not withstanding your internet connection) and there’s enough volume to serve a full meeting room.  Microphone pickup is, so I am told by folks at the other end, excellent.  If you’ve had enough of nerdy-looking headphones OR you want to get your mates/colleagues around the table for a web-call, try it.
Lastly, its unsually stylish and compact enough for your desk or your briefcase (althought it my be a tad fragile).
I’ve never seen one outside of my last company and I don’t understand why. Its a great product and one I am about to buy for my home office.