Avoid toggling buttons. Have a separate button for on, and a second button for off. Idempotent all the way. I remember my great aunt repeatedly mashing the on/

Avoid toggling buttons. Have a separate button for on, and a second button for off. Idempotent all the way. I remember my great aunt repeatedly mashing the on/off button insisting that the TV was not working, when it never had a chance to bring up the picture.