I have previously looked at several reviews of foot warmers. Since the assessment of individual Fusswärmer low-wattage expresses failed poor I thought but little minutely to order me a product with 100 watts, in the hope that this, moreover, if there are 3 stages, but then warmed up properly. I assumed that the heat is like a heating pad, but would work through the foot shape, better and faster. This is, unfortunately but not at all like that. Although the foot warmer has a 3-position switch, but actually are 3 stages useless. It would suffice to Level 3, because the heated only very hesitantly. If you want to warm his cold feet something really quickly, I recommend a hot foot bath, because with this product, you need almost an hour. The device is just a little more than lukewarm, and that at level 3, which made me very disappointed. Otherwise it's a good design, good quality, you can not say anything bad, but I have only imagined otherwise warming, faster, hotter and thus also shorter. You'll need just a lot of time. Too bad.