content: I was a great fan of the Mr. Coffee MUG-ACTIVATED warmer. The ones I had finally gave out so I looked to buying more, and some for friends. I could find only the "on/off switch" warmer (although it was initially called "mug-activated" on the screen) so ordered 2. As already stated, the coffee is kept only warm, and you definitely have to remember to turn OFF the warmer or you could return hours later and find it still ON, which could be a danger. I have been unable to find a mug-activated warmer, but continue the search because I do not believe this "on/off switch" is any good.