For "extra loud" doorbell this product is really very quiet. by 5m and a door behind the Gong is no longer clamps to hear. In my opinion, the advertised number of ringtones is only very limited use. A dog barking, for example is not everyone's favorite. The lack of grid connection went a long way on this but very low rating. 2 stars there due to the adequate coverage. Here there was the required distance no problem.
