Key2

This dedicated key (with a grid of dots) allows you to launch any app from within another app without returning to the home screen.

The physical keyboard isn't just for typing; it’s a massive set of customizable buttons. This dedicated key (with a grid of dots)

The KEY2 officially stopped receiving Android updates years ago (it originally ran Android 8.1). To keep it usable today: This dedicated key (with a grid of dots)