I'm thinking of getting a bluetooth mini mouse to use with my Surface Pro. The one I have my eye on is the Logitech M187 Wireless Mini Mouse. I was looking at a few similar models in a shop the other day and notice they all come with a mini receiver which plugs into the USB port. My question is, as the SP has built in bluetooth is it necessary to use the plug in or will the mouse work without it? I don't want to occupy the sole USB port if it's not necessary, or to use a hub. I like to keep things clean and simple!