This is the Logitech MX Master 4, and it has a new button

Following last month’s Brazilian certification and a quickly-pulled teaser image leak, Logitech’s next-gen mouse has now appeared in a filing with the European Union Intellectual Property Office (EUIPO), giving us the clearest look yet at what’s changing and what’s not.

Here’s what the MX Master 4 looks like.

At first glance, the MX Master 4 sticks close to the design language that’s made the MX Master 3 and 3S beloved tools for so many power users. But look a little…