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Without the dongle, the mouse cannot communicate with the computer. Only logitech produce a dongle with the correct signal to connect to the mouse.
So either order a replacement dongle from logitech or buy a 2nd identical cordless mouse set and keep one mouse as a spare, in case the first one is dropped, becomes faulty or gets lost or temporarily mislaid.
Are you sure your system forfills the system requirements on the MX5000. I once had a wireless keyboard and mouse and because my stem was not in the specifications it frequently lost connection too. You could also try re-installing the drivers. You can find them on the Logitech support page.
Your Logitech MX5000 requires their SetPoint application software to make those changes. I you do not have it, you can download it HERE. Once the software is installed, the time will sync with your laptop and the temperature setting can be changed within the My Keyboard tab.