I had no idea what 130dB was supposed to sound like. It wasn't quite as loud as I thought it would be, but it certainly gets people's attention (which is why I bought it.) I ordered this for my 91 year old grandfather who has had some balance issues. I thought that if he falls, he can use it to get someone's attention to come help. I believe that it will work for my purpose. You can hear it from outside the house and vice-versa. If I were using it for my protection, it would certainly be loud enough to scare off an attacker. Overall, I am very pleased with this product, and I would recommend it to my family and friends.
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