Human senses of the loudness are different, so the bell's sound may quiet or loud to different people. In general, the bells are voices, but not very loud. If the sound is too loud,it may affect the pet hearing. On the other hand, it may bother you and your family resting, so the bell just let you know where your pet is in the house

It is filled with cotton so it is very soft and lightweight for your pet, safety and environmental friendly

Measurement Method
Use scaled rule around the baby's neck a circle measurement