The unit was ordered as a replacement for my in-laws. You own the previous model with a defective outdoor sensor. Since no more replacement was procured and a Umgewöhung was unnecessary, the choice fell on this device. Even in my household tinkers an identical device to the full satisfaction. The outdoor sensor is no longer as sensitive as its predecessor. An artillery attachment is recommended trotdem. This also applies to external sensors from other manufacturers, because good care prolongs shelf life.