On the bathroom with the sensor there is no problem if you are not a long time.I like to swim quite a lot and especially in the sea with the salt you do not have to be more than half an hour in a row because it is softened and in the end water enters and it is stammed.But just rest for a while until you are dry and you can bathe again.You can also help cover the sensor with wide adhesive tape of those used in physiotherapy.In winter I do not need but in summer I always carry it up.