This device is small and noisy and definitely works. But it's SO EASY to take off. I usually throw my keys in my bag all the time and the device randomly goes off and gets a lot of attention (I think that's a good thing). But it comes down to the fact that I'm going to take it off my keys because it will fire randomly when I'm carrying it even if it's still connected. Don't get me wrong, it works, but I prefer not to work during class or work when I don't need to.
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