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I'm not really sure how many stars to give this. I saw a YouTube video simulating how to use the Munio and decided it was the SDK for me. On Easter, I had my two brothers and nephew simulate like they attacking me from behind so that I could try it out on them. They did and I struck them with the Munio as hard as I could but all they did was laugh. They said it didn't hurt them at all and cautioned me to not rely on it for self defense. They each had on heavy denim jeans so I'm not sure if that played a part. Also, when I went to strike them with my keys, my key FOB flew off,. That was good to know because had that been a real event, it could have been diffficult to make a quick getaway, if I can't get into my car. So I'm not really sure what to think of the Munio. I'd probably return it if I had kept the packaging and would stick with my pepper spray.