Temporary use of Magic Mouse instead of Magic Mouse 2

I would like to pair my old Magic Mouse with my newer Late 2015 model iMac.  The iMac came with Magic Mouse 2 but I need something to use temporarily when it is charging up.


My older Mac’s Magic Mouse would be ideal for this purpose if only I could work out how to pair it with my iMac. My iMac seems only to be able to find the MM2.

iMac with Retina 5K display, macOS Sierra (10.12.6), 4ghz i7 16GB RAM June 2016

howapple - hello


pair one at a time. So unpair the MM2 . I use and always have a usb mouse attached in case of issues.