I opted for this foot warmer, because my other reviews appeared quite plausible. Despite some critics I can connect the positive reviews me only. The foot warmer works well and warms up quickly, even if the highest heat level is not too high, it is probably as tempertiert precisely that you can not break a sweat and thus an unpleasant sensation arises. I was aware of this and that therefore no half abgefrorenen feet can be heated, is only logical. For my personal hand it is completely sufficient and also the certainty that it turns off after 90 minutes (you should forget it once) is a big plus. For those who have the (perhaps not too high) heat capacity are aware, it is definitely a buy recommendation.