The product is well designed and the concept! It is heated to very high temperatures a bottle of 240 ml. It takes about 5 minutes this time therefore provide labs. The water which is then used in the reverse thermos really remains hot 12h; allowing its use for 2 times and really helps to have a day out without stress ... I also tested on the potty. The time is longer and if I want the temperature to be homogeneous, it must stir the puree in 2 minutes and allow to heat for 3 minutes. The bottle warmer is really convenient, provided fill with boiling water to 500ml, and follow the instructions. 3 negatives: the product weight (heavy, especially as the cup that covers the thermos is slippery), the fact that there are no loops (shame because it would have been more convenient to carry) and finally the fact that he really use it on a support (risk of burning).