Hardware keys have been used before as toggle switches, most recently in the OnePlus Two, which has a three
stage slider button to toggle the notification mode.
Not exact matches
On one side you'll find the lock
button and volume rocker, while the other side features a new Alert
Slider which will allow you to easily switch between three
stages of Android's alert modes.
A standard oblong power
button sits below a SIM card tray on the right side, with a volume rocker on the left accompanied by the OnePlus standard textured three -
stage Alert
Slider.