That's a lightening bolt. Just saying.
Just plug the mouse receiver into your mac? It uses a USB cable but the mouse itself is wireless. If you're struggling for USB sockets get yourself a USB hub?
The Mamba is a great piece of kit. I have one at home and have considered buying another to use at work.
From my experience Bluetooth isn't the most reliable way to connect anything. I have a Logitech dinovo edge which uses a Bluetooth receiver and it frequently drops it's connection due to interference. Pretty useless while gaming..