By reading the opinions and concerns of "drowning" encountered by some, I hesitated before buying the thermometer. I finally decided to buy it and I do not regret! The fleet updates the thermometer temperature every 5sec and red flashes below 36 ° C and above 38 ° C, like this one is sure to keep baby's bath at the right temperature. The "mood thermometer" outside the bath is also very valuable to see if it is warm enough in the room to exchange or baby wash. PS: no worries of "drowning" met; simply screw the unit correctly once the battery inserted!