Hey Guys! I have a good news for you.
I have a K330 keyboard, and the original mouse (combo with it) was lost. So I had to buy another wireless mouse (M185). When I switched on the mouse the result was… zero! It didn’t work at all.
But… I found this page http://support.logitech.com/en_ch/software/unifying and I downloaded the Unifying software. If the page is not available anymore don’t worry, click here and download it from this blog.
Follow the instructions, and believe me. It will work with a single receiver. Logitech Unifying software lets you manage your devices that use a Unifying receiver. You can add or remove devices using the software’s wizard or use advanced mode. Advanced mode also displays the status of your paired devices, battery level and firmware version.