I used to have a cell phone that had a really handy feature. You could program it to turn itself off after so many minutes of disuse, so as to save the battery.
To turn the phone on, you merely had to hit the on button once.
To turn it off you had to hold the button down for about 10 seconds. So it would seem that the auto turn-off feature would be really useful.
The problem was that its setting was forgotten every time you turned it off, so it always reverted to easy on, tough off. Go figure.
MD