I am very disappointed with my M650 mice. I have been using unifying solar keyboard and mouse for many years without any problem. I decided to get a new mouse and thought the M650 looked like a good one for me. However, it connects to Bluetooth and then loses connection, even though I've been through device manager and turned off power saving on everything I can see. If I put the Bolt receiver into a USB port it shows as 'Wireless Device' and Options+ can't see it.
It appears that the Bolt receiver is incompatible with the Unifying receiver so I would have to get a new keyboard to get rid of the Unifying receiver and maybe get the M650 to work properly.

If there are settings, such as power saving, which need to be changed then the installation should do it. I have a lot of knowledge about machines so heaven help anyone who doesn't