I use the Double Switch 2 to switch my mirror heater in the bathroom via a pulse switch. The moment the switch is turned on, the 2 Philips Hue lamps above the mirror turn green for 2 seconds to indicate that the mirror heating is on. By clicking the switch again, the mirror heating goes off naturally and the 2 Philips Hue spots turn red for 2 seconds.
The moment I forget to switch off the mirror heating, it switches off automatically when I switch off the light in the bathroom (Philips Hue spots).
I don't use the second switch to switch, but to start scenes. This way I can turn my Sonos One on/off depending on the playback status. Clicking 2x increases the volume of my Sonos One to 15% and holding down the 2nd switch for a long time causes the volume of my Sonos One speaker to go back to 8%.
I linked this via: Homey van Athom.