My elderly dad has a memory problem and ALWAYS hides and loses his wallet! It's thin enough that he doesn't take it off and claims it bothers him (as he has with several other brands). It's also loud enough to be heard through piles of clothes, closets, and the like. I've tried other brands and this is the only one that seems to have a long lasting battery, loud sound and actually small thickness. Plus, it's incredibly easy to set up and use, the app is self-explanatory and only took a few seconds to set up. If you're disappointed with the other viewfinders you've bought but definitely need them, give this one a try. The price is also affordable!
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