Not yet tested by car but impessable for use at home. Dad uses it to warm the breast milk bottle out of the fridge, in 2 min top chrono a bib 125 is ready! The doses are to be adapted, for example, to a bib 120 they recommend measures 10, we found the bin too hot hair, 9 ml is used. Attention bottle it is even qd even hot when it comes out. But it's the same if reheated in a pan in water bath (what we did before). Obviously this item is not essential, but it is a good time saver when the baby is getting impatient! Especially for a beginner dad who's still a little awkward :-)))) Otherwise, I was surprised to its size, quite small and compact, discreet and nice. Beware remains of evaporations after the alarm has sounded: in fact, it continues to do so qqs second "chhhh" the iron in steam mode :-) Think wipe the bottle coming out, there is always qqs drops.