I've had this keychain for a few months now. At first I found it amazing. A quick test shows that the noise will definitely attract attention. However, after a few months of just using it as a keychain, the sound stopped working. My first thought is the battery but why has it died without use in such a short time. What if I really need it but haven't noticed the sound has stopped working? Overall I wouldn't rely on it for added security. This is a keychain only.
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